diff --git a/src/Microsoft.AspNetCore.Mvc.Core/Infrastructure/ProblemDetailsClientErrorFactory.cs b/src/Microsoft.AspNetCore.Mvc.Core/Infrastructure/ProblemDetailsClientErrorFactory.cs
index 1bf1e3ac43..ff47a18fa6 100644
--- a/src/Microsoft.AspNetCore.Mvc.Core/Infrastructure/ProblemDetailsClientErrorFactory.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Core/Infrastructure/ProblemDetailsClientErrorFactory.cs
@@ -2,12 +2,14 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Diagnostics;
 using Microsoft.Extensions.Options;
 
 namespace Microsoft.AspNetCore.Mvc.Infrastructure
 {
     internal class ProblemDetailsClientErrorFactory : IClientErrorFactory
     {
+        private static readonly string TraceIdentifierKey = "traceId";
         private readonly ApiBehaviorOptions _options;
 
         public ProblemDetailsClientErrorFactory(IOptions<ApiBehaviorOptions> options)
@@ -28,6 +30,8 @@ namespace Microsoft.AspNetCore.Mvc.Infrastructure
             {
                 problemDetails.Title = errorData.Title;
                 problemDetails.Type = errorData.Link;
+
+                SetTraceId(actionContext, problemDetails);
             }
 
             return new ObjectResult(problemDetails)
@@ -40,5 +44,11 @@ namespace Microsoft.AspNetCore.Mvc.Infrastructure
                 },
             };
         }
+
+        internal static void SetTraceId(ActionContext actionContext, ProblemDetails problemDetails)
+        {
+            var traceId = Activity.Current?.Id ?? actionContext.HttpContext.TraceIdentifier;
+            problemDetails.Extensions[TraceIdentifierKey] = traceId;
+        }
     }
 }
diff --git a/src/Microsoft.AspNetCore.Mvc.Core/Internal/ApiBehaviorOptionsSetup.cs b/src/Microsoft.AspNetCore.Mvc.Core/Internal/ApiBehaviorOptionsSetup.cs
index 4d64d9bb84..bddaaa2478 100644
--- a/src/Microsoft.AspNetCore.Mvc.Core/Internal/ApiBehaviorOptionsSetup.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Core/Internal/ApiBehaviorOptionsSetup.cs
@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc.Core;
 using Microsoft.AspNetCore.Mvc.Infrastructure;
 using Microsoft.Extensions.Logging;
@@ -128,9 +129,16 @@ namespace Microsoft.AspNetCore.Mvc.Internal
             return result;
         }
 
-        private static IActionResult ProblemDetailsInvalidModelStateResponse(ActionContext context)
+        internal static IActionResult ProblemDetailsInvalidModelStateResponse(ActionContext context)
         {
-            var result = new BadRequestObjectResult(new ValidationProblemDetails(context.ModelState));
+            var problemDetails = new ValidationProblemDetails(context.ModelState)
+            {
+                Status = StatusCodes.Status400BadRequest,
+            };
+
+            ProblemDetailsClientErrorFactory.SetTraceId(context, problemDetails);
+
+            var result = new BadRequestObjectResult(problemDetails);
 
             result.ContentTypes.Add("application/problem+json");
             result.ContentTypes.Add("application/problem+xml");
diff --git a/test/Microsoft.AspNetCore.Mvc.Core.Test/Infrastructure/ProblemDetalsClientErrorFactoryTest.cs b/test/Microsoft.AspNetCore.Mvc.Core.Test/Infrastructure/ProblemDetalsClientErrorFactoryTest.cs
index 65a53a8158..603b60e381 100644
--- a/test/Microsoft.AspNetCore.Mvc.Core.Test/Infrastructure/ProblemDetalsClientErrorFactoryTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.Core.Test/Infrastructure/ProblemDetalsClientErrorFactoryTest.cs
@@ -1,6 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System.Diagnostics;
+using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Options;
 using Xunit;
 
@@ -22,7 +24,7 @@ namespace Microsoft.AspNetCore.Mvc.Infrastructure
             }));
 
             // Act
-            var result = factory.GetClientError(new ActionContext(), clientError);
+            var result = factory.GetClientError(GetActionContext(), clientError);
 
             // Assert
             var objectResult = Assert.IsType<ObjectResult>(result);
@@ -49,7 +51,7 @@ namespace Microsoft.AspNetCore.Mvc.Infrastructure
             }));
 
             // Act
-            var result = factory.GetClientError(new ActionContext(), clientError);
+            var result = factory.GetClientError(GetActionContext(), clientError);
 
             // Assert
             var objectResult = Assert.IsType<ObjectResult>(result);
@@ -61,5 +63,67 @@ namespace Microsoft.AspNetCore.Mvc.Infrastructure
             Assert.Null(problemDetails.Detail);
             Assert.Null(problemDetails.Instance);
         }
+
+        [Fact]
+        public void GetClientError_UsesActivityId_ToSetTraceId()
+        {
+            // Arrange
+            using (new ActivityReplacer())
+            {
+                var clientError = new UnsupportedMediaTypeResult();
+                var factory = new ProblemDetailsClientErrorFactory(Options.Create(new ApiBehaviorOptions
+                {
+                    ClientErrorMapping =
+                {
+                    [415] = new ClientErrorData { Link = "Some link", Title = "Summary" },
+                },
+                }));
+
+                // Act
+                var result = factory.GetClientError(GetActionContext(), clientError);
+
+                // Assert
+                var objectResult = Assert.IsType<ObjectResult>(result);
+                Assert.Equal(new[] { "application/problem+json", "application/problem+xml" }, objectResult.ContentTypes);
+                var problemDetails = Assert.IsType<ProblemDetails>(objectResult.Value);
+
+                Assert.Equal(Activity.Current.Id, problemDetails.Extensions["traceId"]);
+            }
+        }
+
+        [Fact]
+        public void GetClientError_UsesHttpContext_ToSetTraceIdIfActivityIdIsNotSet()
+        {
+            // Arrange
+            var clientError = new UnsupportedMediaTypeResult();
+            var factory = new ProblemDetailsClientErrorFactory(Options.Create(new ApiBehaviorOptions
+            {
+                ClientErrorMapping =
+                {
+                    [415] = new ClientErrorData { Link = "Some link", Title = "Summary" },
+                },
+            }));
+
+            // Act
+            var result = factory.GetClientError(GetActionContext(), clientError);
+
+            // Assert
+            var objectResult = Assert.IsType<ObjectResult>(result);
+            Assert.Equal(new[] { "application/problem+json", "application/problem+xml" }, objectResult.ContentTypes);
+            var problemDetails = Assert.IsType<ProblemDetails>(objectResult.Value);
+
+            Assert.Equal("42", problemDetails.Extensions["traceId"]);
+        }
+
+        private static ActionContext GetActionContext()
+        {
+            return new ActionContext
+            {
+                HttpContext = new DefaultHttpContext
+                {
+                    TraceIdentifier = "42",
+                }
+            };
+        }
     }
 }
diff --git a/test/Microsoft.AspNetCore.Mvc.Core.Test/Internal/ApiBehaviorOptionsSetupTest.cs b/test/Microsoft.AspNetCore.Mvc.Core.Test/Internal/ApiBehaviorOptionsSetupTest.cs
index 622a36e5ff..4ae53cd4d7 100644
--- a/test/Microsoft.AspNetCore.Mvc.Core.Test/Internal/ApiBehaviorOptionsSetupTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.Core.Test/Internal/ApiBehaviorOptionsSetupTest.cs
@@ -2,6 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Diagnostics;
+using System.Linq;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc.Infrastructure;
 using Microsoft.Extensions.Logging.Abstractions;
 using Microsoft.Extensions.Options;
@@ -97,5 +100,64 @@ namespace Microsoft.AspNetCore.Mvc.Internal
             // Assert
             Assert.Same(expected, options.InvalidModelStateResponseFactory);
         }
+
+        [Fact]
+        public void ProblemDetailsInvalidModelStateResponse_ReturnsBadRequestWithProblemDetails()
+        {
+            // Arrange
+            var actionContext = new ActionContext
+            {
+                HttpContext = new DefaultHttpContext { TraceIdentifier = "42" },
+            };
+
+            // Act
+            var result = ApiBehaviorOptionsSetup.ProblemDetailsInvalidModelStateResponse(actionContext);
+
+            // Assert
+            var badRequest = Assert.IsType<BadRequestObjectResult>(result);
+            Assert.Equal(new[] { "application/problem+json", "application/problem+xml" }, badRequest.ContentTypes.OrderBy(c => c));
+
+            var problemDetails = Assert.IsType<ValidationProblemDetails>(badRequest.Value);
+            Assert.Equal(400, problemDetails.Status);
+        }
+
+        [Fact]
+        public void ProblemDetailsInvalidModelStateResponse_SetsTraceId()
+        {
+            // Arrange
+            using (new ActivityReplacer())
+            {
+                var actionContext = new ActionContext
+                {
+                    HttpContext = new DefaultHttpContext { TraceIdentifier = "42" },
+                };
+
+                // Act
+                var result = ApiBehaviorOptionsSetup.ProblemDetailsInvalidModelStateResponse(actionContext);
+
+                // Assert
+                var badRequest = Assert.IsType<BadRequestObjectResult>(result);
+                var problemDetails = Assert.IsType<ValidationProblemDetails>(badRequest.Value);
+                Assert.Equal(Activity.Current.Id, problemDetails.Extensions["traceId"]);
+            }
+        }
+
+        [Fact]
+        public void ProblemDetailsInvalidModelStateResponse_SetsTraceIdFromRequest_IfActivityIsNull()
+        {
+            // Arrange
+            var actionContext = new ActionContext
+            {
+                HttpContext = new DefaultHttpContext { TraceIdentifier = "42" },
+            };
+
+            // Act
+            var result = ApiBehaviorOptionsSetup.ProblemDetailsInvalidModelStateResponse(actionContext);
+
+            // Assert
+            var badRequest = Assert.IsType<BadRequestObjectResult>(result);
+            var problemDetails = Assert.IsType<ValidationProblemDetails>(badRequest.Value);
+            Assert.Equal("42", problemDetails.Extensions["traceId"]);
+        }
     }
 }
diff --git a/test/Microsoft.AspNetCore.Mvc.Core.TestCommon/ActivityReplacer.cs b/test/Microsoft.AspNetCore.Mvc.Core.TestCommon/ActivityReplacer.cs
new file mode 100644
index 0000000000..f7bc9d8193
--- /dev/null
+++ b/test/Microsoft.AspNetCore.Mvc.Core.TestCommon/ActivityReplacer.cs
@@ -0,0 +1,25 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Diagnostics;
+
+namespace Microsoft.AspNetCore.Mvc
+{
+    public class ActivityReplacer : IDisposable
+    {
+        private readonly Activity _activity;
+
+        public ActivityReplacer()
+        {
+            _activity = new Activity("Test");
+            _activity.Start();
+        }
+
+        public void Dispose()
+        {
+            Debug.Assert(Activity.Current == _activity);
+            _activity.Stop();
+        }
+    }
+}
diff --git a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/ApiBehaviorTest.cs b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/ApiBehaviorTest.cs
index 127d612fdd..c30dd30750 100644
--- a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/ApiBehaviorTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/ApiBehaviorTest.cs
@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Net;
 using System.Net.Http;
@@ -35,37 +36,48 @@ namespace Microsoft.AspNetCore.Mvc.FunctionalTests
         public async Task ActionsReturnBadRequest_WhenModelStateIsInvalid()
         {
             // Arrange
-            var contactModel = new Contact
+            using (new ActivityReplacer())
             {
-                Name = "Abc",
-                City = "Redmond",
-                State = "WA",
-                Zip = "Invalid",
-            };
-            var contactString = JsonConvert.SerializeObject(contactModel);
-
-            // Act
-            var response = await Client.PostAsJsonAsync("/contact", contactModel);
-
-            // Assert
-            await response.AssertStatusCodeAsync(HttpStatusCode.BadRequest);
-            Assert.Equal("application/problem+json", response.Content.Headers.ContentType.MediaType);
-            var problemDetails = JsonConvert.DeserializeObject<ValidationProblemDetails>(await response.Content.ReadAsStringAsync());
-            Assert.Collection(
-                problemDetails.Errors.OrderBy(kvp => kvp.Key),
-                kvp =>
+                var contactModel = new Contact
                 {
-                    Assert.Equal("Name", kvp.Key);
-                    var error = Assert.Single(kvp.Value);
-                    Assert.Equal("The field Name must be a string with a minimum length of 5 and a maximum length of 30.", error);
-                },
-                kvp =>
-                {
-                    Assert.Equal("Zip", kvp.Key);
-                    var error = Assert.Single(kvp.Value);
-                    Assert.Equal("The field Zip must match the regular expression '\\d{5}'.", error);
-                }
-            );
+                    Name = "Abc",
+                    City = "Redmond",
+                    State = "WA",
+                    Zip = "Invalid",
+                };
+                var contactString = JsonConvert.SerializeObject(contactModel);
+
+                // Act
+                var response = await Client.PostAsJsonAsync("/contact", contactModel);
+
+                // Assert
+                await response.AssertStatusCodeAsync(HttpStatusCode.BadRequest);
+                Assert.Equal("application/problem+json", response.Content.Headers.ContentType.MediaType);
+                var problemDetails = JsonConvert.DeserializeObject<ValidationProblemDetails>(await response.Content.ReadAsStringAsync());
+                Assert.Collection(
+                    problemDetails.Errors.OrderBy(kvp => kvp.Key),
+                    kvp =>
+                    {
+                        Assert.Equal("Name", kvp.Key);
+                        var error = Assert.Single(kvp.Value);
+                        Assert.Equal("The field Name must be a string with a minimum length of 5 and a maximum length of 30.", error);
+                    },
+                    kvp =>
+                    {
+                        Assert.Equal("Zip", kvp.Key);
+                        var error = Assert.Single(kvp.Value);
+                        Assert.Equal("The field Zip must match the regular expression '\\d{5}'.", error);
+                    }
+                );
+
+                Assert.Collection(
+                    problemDetails.Extensions,
+                    kvp =>
+                    {
+                        Assert.Equal("traceId", kvp.Key);
+                        Assert.Equal(Activity.Current.Id, kvp.Value);
+                    });
+            }
         }
 
         [Fact]
@@ -253,21 +265,31 @@ namespace Microsoft.AspNetCore.Mvc.FunctionalTests
         [Fact]
         public async Task ClientErrorResultFilterExecutesForStatusCodeResults()
         {
-            // Act
-            var response = await Client.GetAsync("/contact/ActionReturningStatusCodeResult");
+            using (new ActivityReplacer())
+            {
+                // Act
+                var response = await Client.GetAsync("/contact/ActionReturningStatusCodeResult");
 
-            // Assert
-            await response.AssertStatusCodeAsync(HttpStatusCode.NotFound);
-            var content = await response.Content.ReadAsStringAsync();
-            var problemDetails = JsonConvert.DeserializeObject<ProblemDetails>(content);
-            Assert.Equal(404, problemDetails.Status);
+                // Assert
+                await response.AssertStatusCodeAsync(HttpStatusCode.NotFound);
+                var content = await response.Content.ReadAsStringAsync();
+                var problemDetails = JsonConvert.DeserializeObject<ProblemDetails>(content);
+                Assert.Equal(404, problemDetails.Status);
+                Assert.Collection(
+                    problemDetails.Extensions,
+                    kvp =>
+                    {
+                        Assert.Equal("traceId", kvp.Key);
+                        Assert.Equal(Activity.Current.Id, kvp.Value);
+                    });
+            }
         }
 
         [Fact]
         public async Task SerializingProblemDetails_IgnoresNullValuedProperties()
         {
             // Arrange
-            var expected = new[] { "status", "title", "type" };
+            var expected = new[] { "status", "title", "traceId", "type" };
 
             // Act
             var response = await Client.GetAsync("/contact/ActionReturningStatusCodeResult");
@@ -310,7 +332,14 @@ namespace Microsoft.AspNetCore.Mvc.FunctionalTests
 
             Assert.Equal("Error", validationProblemDetails.Title);
             Assert.Equal(400, validationProblemDetails.Status);
-            Assert.Equal("27", validationProblemDetails.Extensions["tracking-id"]);
+            Assert.Collection(
+                validationProblemDetails.Extensions,
+                kvp =>
+                {
+                    Assert.Equal("tracking-id", kvp.Key);
+                    Assert.Equal("27", kvp.Value);
+                });
+
             Assert.Collection(
                 validationProblemDetails.Errors,
                 kvp =>
diff --git a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/Microsoft.AspNetCore.Mvc.FunctionalTests.csproj b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/Microsoft.AspNetCore.Mvc.FunctionalTests.csproj
index 1e7cb2f215..bce36312a4 100644
--- a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/Microsoft.AspNetCore.Mvc.FunctionalTests.csproj
+++ b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/Microsoft.AspNetCore.Mvc.FunctionalTests.csproj
@@ -10,6 +10,7 @@
 
   <ItemGroup>
     <Compile Include="..\Microsoft.AspNetCore.Mvc.Formatters.Xml.Test\XmlAssert.cs" />
+    <Compile Include="..\Microsoft.AspNetCore.Mvc.Core.TestCommon\ActivityReplacer.cs" />
     <EmbeddedResource Include="compiler\resources\**\*" />
     <None Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
diff --git a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/XmlDataContractSerializerFormattersWrappingTest.cs b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/XmlDataContractSerializerFormattersWrappingTest.cs
index 9ee16921a6..2e34fbbe27 100644
--- a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/XmlDataContractSerializerFormattersWrappingTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/XmlDataContractSerializerFormattersWrappingTest.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System.Diagnostics;
 using System.Net;
 using System.Net.Http;
 using System.Net.Http.Headers;
@@ -213,15 +214,23 @@ namespace Microsoft.AspNetCore.Mvc.FunctionalTests
         public async Task ProblemDetails_IsSerialized()
         {
             // Arrange
-            var expected = @"<ProblemDetails><Status>404</Status><Title>Not Found</Title><Type>https://tools.ietf.org/html/rfc7231#section-6.5.4</Type></ProblemDetails>";
+            using (new ActivityReplacer())
+            {
+                var expected = "<ProblemDetails>" +
+                    "<Status>404</Status>" +
+                    "<Title>Not Found</Title>" +
+                    "<Type>https://tools.ietf.org/html/rfc7231#section-6.5.4</Type>" +
+                    $"<traceId>{Activity.Current.Id}</traceId>" +
+                    "</ProblemDetails>";
 
-            // Act
-            var response = await Client.GetAsync("/api/XmlDataContractApi/ActionReturningClientErrorStatusCodeResult");
+                // Act
+                var response = await Client.GetAsync("/api/XmlDataContractApi/ActionReturningClientErrorStatusCodeResult");
 
-            // Assert
-            await response.AssertStatusCodeAsync(HttpStatusCode.NotFound);
-            var content = await response.Content.ReadAsStringAsync();
-            XmlAssert.Equal(expected, content);
+                // Assert
+                await response.AssertStatusCodeAsync(HttpStatusCode.NotFound);
+                var content = await response.Content.ReadAsStringAsync();
+                XmlAssert.Equal(expected, content);
+            }
         }
 
         [Fact]
@@ -244,16 +253,25 @@ namespace Microsoft.AspNetCore.Mvc.FunctionalTests
         public async Task ValidationProblemDetails_IsSerialized()
         {
             // Arrange
-            var expected = @"<ValidationProblemDetails><Status>400</Status><Title>One or more validation errors occurred.</Title>
-<MVC-Errors><State>The State field is required.</State></MVC-Errors></ValidationProblemDetails>";
+            using (new ActivityReplacer())
+            {
+                var expected = "<ValidationProblemDetails>" +
+                "<Status>400</Status>" +
+                "<Title>One or more validation errors occurred.</Title>" +
+                $"<traceId>{Activity.Current.Id}</traceId>" +
+                "<MVC-Errors>" +
+                "<State>The State field is required.</State>" +
+                "</MVC-Errors>" +
+                "</ValidationProblemDetails>";
 
-            // Act
-            var response = await Client.GetAsync("/api/XmlDataContractApi/ActionReturningValidationProblem");
+                // Act
+                var response = await Client.GetAsync("/api/XmlDataContractApi/ActionReturningValidationProblem");
 
-            // Assert
-            await response.AssertStatusCodeAsync(HttpStatusCode.BadRequest);
-            var content = await response.Content.ReadAsStringAsync();
-            XmlAssert.Equal(expected, content);
+                // Assert
+                await response.AssertStatusCodeAsync(HttpStatusCode.BadRequest);
+                var content = await response.Content.ReadAsStringAsync();
+                XmlAssert.Equal(expected, content);
+            }
         }
 
         [Fact]
diff --git a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/XmlSerializerFormattersWrappingTest.cs b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/XmlSerializerFormattersWrappingTest.cs
index d54cd3880c..b8b41c5f0a 100644
--- a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/XmlSerializerFormattersWrappingTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/XmlSerializerFormattersWrappingTest.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System.Diagnostics;
 using System.Net;
 using System.Net.Http;
 using System.Net.Http.Headers;
@@ -188,15 +189,23 @@ namespace Microsoft.AspNetCore.Mvc.FunctionalTests
         public async Task ProblemDetails_IsSerialized()
         {
             // Arrange
-            var expected = @"<ProblemDetails><Status>404</Status><Title>Not Found</Title><Type>https://tools.ietf.org/html/rfc7231#section-6.5.4</Type></ProblemDetails>";
+            using (new ActivityReplacer())
+            {
+                var expected = "<ProblemDetails>" +
+                    "<Status>404</Status>" +
+                    "<Title>Not Found</Title>" +
+                    "<Type>https://tools.ietf.org/html/rfc7231#section-6.5.4</Type>" +
+                    $"<traceId>{Activity.Current.Id}</traceId>" +
+                    "</ProblemDetails>";
 
-            // Act
-            var response = await Client.GetAsync("/api/XmlSerializerApi/ActionReturningClientErrorStatusCodeResult");
+                // Act
+                var response = await Client.GetAsync("/api/XmlSerializerApi/ActionReturningClientErrorStatusCodeResult");
 
-            // Assert
-            await response.AssertStatusCodeAsync(HttpStatusCode.NotFound);
-            var content = await response.Content.ReadAsStringAsync();
-            XmlAssert.Equal(expected, content);
+                // Assert
+                await response.AssertStatusCodeAsync(HttpStatusCode.NotFound);
+                var content = await response.Content.ReadAsStringAsync();
+                XmlAssert.Equal(expected, content);
+            }
         }
 
         [Fact]
@@ -219,16 +228,25 @@ namespace Microsoft.AspNetCore.Mvc.FunctionalTests
         public async Task ValidationProblemDetails_IsSerialized()
         {
             // Arrange
-            var expected = @"<ValidationProblemDetails><Status>400</Status><Title>One or more validation errors occurred.</Title>
-<MVC-Errors><State>The State field is required.</State></MVC-Errors></ValidationProblemDetails>";
+            using (new ActivityReplacer())
+            {
+                var expected = "<ValidationProblemDetails>" +
+               "<Status>400</Status>" +
+               "<Title>One or more validation errors occurred.</Title>" +
+               $"<traceId>{Activity.Current.Id}</traceId>" +
+               "<MVC-Errors>" +
+               "<State>The State field is required.</State>" +
+               "</MVC-Errors>" +
+               "</ValidationProblemDetails>";
 
-            // Act
-            var response = await Client.GetAsync("/api/XmlSerializerApi/ActionReturningValidationProblem");
+                // Act
+                var response = await Client.GetAsync("/api/XmlSerializerApi/ActionReturningValidationProblem");
 
-            // Assert
-            await response.AssertStatusCodeAsync(HttpStatusCode.BadRequest);
-            var content = await response.Content.ReadAsStringAsync();
-            XmlAssert.Equal(expected, content);
+                // Assert
+                await response.AssertStatusCodeAsync(HttpStatusCode.BadRequest);
+                var content = await response.Content.ReadAsStringAsync();
+                XmlAssert.Equal(expected, content);
+            }
         }
 
         [Fact]