diff --git a/src/Microsoft.AspNetCore.Localization/RequestCultureProviderLoggerExtensions.cs b/src/Microsoft.AspNetCore.Localization/Internal/RequestCultureProviderLoggerExtensions.cs
similarity index 94%
rename from src/Microsoft.AspNetCore.Localization/RequestCultureProviderLoggerExtensions.cs
rename to src/Microsoft.AspNetCore.Localization/Internal/RequestCultureProviderLoggerExtensions.cs
index d7d6821a7b..ee435cda69 100644
--- a/src/Microsoft.AspNetCore.Localization/RequestCultureProviderLoggerExtensions.cs
+++ b/src/Microsoft.AspNetCore.Localization/Internal/RequestCultureProviderLoggerExtensions.cs
@@ -6,7 +6,7 @@ using System.Collections.Generic;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Primitives;
 
-namespace Microsoft.AspNetCore.Localization
+namespace Microsoft.AspNetCore.Localization.Internal
 {
     internal static class RequestCultureProviderLoggerExtensions
     {
@@ -22,7 +22,7 @@ namespace Microsoft.AspNetCore.Localization
             _unsupportedUICulture = LoggerMessage.Define<string, IList<StringSegment>>(
                 LogLevel.Warning,
                 2,
-                "{requestCultureProvider} returned the following unsupported cultures '{cultures}'.");
+                "{requestCultureProvider} returned the following unsupported UI Cultures '{uiCultures}'.");
         }
 
         public static void UnsupportedCultures(this ILogger logger, string requestCultureProvider, IList<StringSegment> cultures)
diff --git a/src/Microsoft.AspNetCore.Localization/RequestLocalizationMiddleware.cs b/src/Microsoft.AspNetCore.Localization/RequestLocalizationMiddleware.cs
index b186a7693c..7c2462a4b7 100644
--- a/src/Microsoft.AspNetCore.Localization/RequestLocalizationMiddleware.cs
+++ b/src/Microsoft.AspNetCore.Localization/RequestLocalizationMiddleware.cs
@@ -8,6 +8,7 @@ using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Localization.Internal;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
@@ -98,7 +99,7 @@ namespace Microsoft.AspNetCore.Localization
                         if (uiCultureInfo == null)
                         {
                             EnsureLogger(context);
-                           _logger?.UnsupportedCultures(provider.GetType().Name, uiCultures);
+                           _logger?.UnsupportedUICultures(provider.GetType().Name, uiCultures);
                         }
                     }
 
diff --git a/test/Microsoft.AspNetCore.Localization.Tests/CookieRequestCultureProviderTest.cs b/test/Microsoft.AspNetCore.Localization.Tests/CookieRequestCultureProviderTest.cs
index f74ea77cf8..eb68dad76e 100644
--- a/test/Microsoft.AspNetCore.Localization.Tests/CookieRequestCultureProviderTest.cs
+++ b/test/Microsoft.AspNetCore.Localization.Tests/CookieRequestCultureProviderTest.cs
@@ -146,14 +146,12 @@ namespace Microsoft.Extensions.Localization
             }
         }
 
-        [Theory]
-        [InlineData("??", "en-US", "CookieRequestCultureProvider returned the following unsupported cultures '??'.")]
-        [InlineData("en-US", "??", "CookieRequestCultureProvider returned the following unsupported cultures '??'.")]
-        public async Task UnsupportedCulturesShouldLogWarning(string culture, string uiCulture, string expectedMessage)
+        [Fact]
+        public async Task RequestLocalizationMiddleware_LogsWarningsForUnsupportedCultures()
         {
             var sink = new TestSink(
-                TestSink.EnableWithTypeName<CookieRequestCultureProvider>,
-                TestSink.EnableWithTypeName<CookieRequestCultureProvider>);
+                TestSink.EnableWithTypeName<RequestLocalizationMiddleware>,
+                TestSink.EnableWithTypeName<RequestLocalizationMiddleware>);
             var loggerFactory = new TestLoggerFactory(sink, enabled: true);
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -176,14 +174,7 @@ namespace Microsoft.Extensions.Localization
                     };
                     options.RequestCultureProviders.Insert(0, provider);
                     app.UseRequestLocalization(options);
-                    app.Run(context =>
-                    {
-                        var requestCultureFeature = context.Features.Get<IRequestCultureFeature>();
-                        var requestCulture = requestCultureFeature.RequestCulture;
-                        Assert.Equal("en-US", requestCulture.Culture.Name);
-                        Assert.NotNull(context.RequestServices.GetService<ILogger<RequestLocalizationMiddleware>>());
-                        return Task.FromResult(0);
-                    });
+                    app.Run(context => Task.CompletedTask);
                 })
                 .ConfigureServices(services =>
                 {
@@ -193,12 +184,70 @@ namespace Microsoft.Extensions.Localization
             using (var server = new TestServer(builder))
             {
                 var client = server.CreateClient();
+                var culture = "??";
+                var uiCulture = "ar-YE";
                 client.DefaultRequestHeaders.Add("Cookie", new CookieHeaderValue("Preferences", $"c={culture}|uic={uiCulture}").ToString());
 
                 var response = await client.GetAsync(string.Empty);
                 response.EnsureSuccessStatusCode();
             }
 
+            var expectedMessage = $"{nameof(CookieRequestCultureProvider)} returned the following unsupported cultures '??'.";
+            var logMessages = sink.Writes;
+            var count = logMessages.Count;
+
+            Assert.Equal(1, count);
+            Assert.Equal(LogLevel.Warning, logMessages[0].LogLevel);
+            Assert.Equal(expectedMessage, logMessages[0].State.ToString());
+        }
+
+        [Fact]
+        public async Task RequestLocalizationMiddleware_LogsWarningsForUnsupportedUICultures()
+        {
+            var sink = new TestSink(
+                TestSink.EnableWithTypeName<RequestLocalizationMiddleware>,
+                TestSink.EnableWithTypeName<RequestLocalizationMiddleware>);
+            var loggerFactory = new TestLoggerFactory(sink, enabled: true);
+            var builder = new WebHostBuilder()
+                .Configure(app =>
+                {
+                    var options = new RequestLocalizationOptions
+                    {
+                        DefaultRequestCulture = new RequestCulture("en-US"),
+                        SupportedCultures = new List<CultureInfo>
+                        {
+                            new CultureInfo("ar-YE")
+                        },
+                        SupportedUICultures = new List<CultureInfo>
+                        {
+                            new CultureInfo("ar-YE")
+                        }
+                    };
+                    var provider = new CookieRequestCultureProvider
+                    {
+                        CookieName = "Preferences"
+                    };
+                    options.RequestCultureProviders.Insert(0, provider);
+                    app.UseRequestLocalization(options);
+                    app.Run(context => Task.CompletedTask);
+                })
+                .ConfigureServices(services =>
+                {
+                    services.AddSingleton(typeof(ILoggerFactory), loggerFactory);
+                });
+
+            using (var server = new TestServer(builder))
+            {
+                var client = server.CreateClient();
+                var culture = "ar-YE";
+                var uiCulture = "??";
+                client.DefaultRequestHeaders.Add("Cookie", new CookieHeaderValue("Preferences", $"c={culture}|uic={uiCulture}").ToString());
+
+                var response = await client.GetAsync(string.Empty);
+                response.EnsureSuccessStatusCode();
+            }
+
+            var expectedMessage = $"{nameof(CookieRequestCultureProvider)} returned the following unsupported UI Cultures '??'.";
             var logMessages = sink.Writes;
             var count = logMessages.Count;
 
diff --git a/test/Microsoft.AspNetCore.Localization.Tests/Microsoft.AspNetCore.Localization.Tests.csproj b/test/Microsoft.AspNetCore.Localization.Tests/Microsoft.AspNetCore.Localization.Tests.csproj
index 6f61780042..f58033bd9e 100644
--- a/test/Microsoft.AspNetCore.Localization.Tests/Microsoft.AspNetCore.Localization.Tests.csproj
+++ b/test/Microsoft.AspNetCore.Localization.Tests/Microsoft.AspNetCore.Localization.Tests.csproj
@@ -11,9 +11,9 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.TestHost" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="$(AspNetCoreVersion)" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" />
     <PackageReference Include="Microsoft.Extensions.Logging" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Testing" Version="$(AspNetCoreVersion)" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Testing" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.runner.visualstudio" />