diff --git a/src/Core/Microsoft.Extensions.Identity.Core.csproj b/src/Core/Microsoft.Extensions.Identity.Core.csproj
index f73848a02d..c446217071 100644
--- a/src/Core/Microsoft.Extensions.Identity.Core.csproj
+++ b/src/Core/Microsoft.Extensions.Identity.Core.csproj
@@ -5,7 +5,6 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;identity;membership</PackageTags>
-    <EnableApiCheck>false</EnableApiCheck>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/Core/breakingchanges.netcore.json b/src/Core/breakingchanges.netcore.json
new file mode 100644
index 0000000000..3540ff03a1
--- /dev/null
+++ b/src/Core/breakingchanges.netcore.json
@@ -0,0 +1,17 @@
+  [
+    {
+      "TypeId": "public class Microsoft.AspNetCore.Identity.UserManager<T0> : System.IDisposable where T0 : class",
+      "MemberId": "protected const System.String ChangePhoneNumberTokenPurpose = \"ChangePhoneNumber\"",
+      "Kind": "Removal"
+    },
+    {
+      "TypeId": "public class Microsoft.AspNetCore.Identity.UserManager<T0> : System.IDisposable where T0 : class",
+      "MemberId": "protected const System.String ConfirmEmailTokenPurpose = \"EmailConfirmation\"",
+      "Kind": "Removal"
+    },
+    {
+      "TypeId": "public class Microsoft.AspNetCore.Identity.UserManager<T0> : System.IDisposable where T0 : class",
+      "MemberId": "protected const System.String ResetPasswordTokenPurpose = \"ResetPassword\"",
+      "Kind": "Removal"
+    }
+  ]
\ No newline at end of file
diff --git a/src/Identity/Microsoft.AspNetCore.Identity.csproj b/src/Identity/Microsoft.AspNetCore.Identity.csproj
index 6d83fe847b..fc0fae70c8 100644
--- a/src/Identity/Microsoft.AspNetCore.Identity.csproj
+++ b/src/Identity/Microsoft.AspNetCore.Identity.csproj
@@ -5,7 +5,6 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;identity;membership</PackageTags>
-    <EnableApiCheck>false</EnableApiCheck>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/Stores/Microsoft.Extensions.Identity.Stores.csproj b/src/Stores/Microsoft.Extensions.Identity.Stores.csproj
index 0a792aeca2..10e6e98997 100644
--- a/src/Stores/Microsoft.Extensions.Identity.Stores.csproj
+++ b/src/Stores/Microsoft.Extensions.Identity.Stores.csproj
@@ -5,7 +5,6 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;identity;membership</PackageTags>
-    <EnableApiCheck>false</EnableApiCheck>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/UI/Microsoft.AspNetCore.Identity.UI.csproj b/src/UI/Microsoft.AspNetCore.Identity.UI.csproj
index e81d9c1a8d..90fbc7c140 100644
--- a/src/UI/Microsoft.AspNetCore.Identity.UI.csproj
+++ b/src/UI/Microsoft.AspNetCore.Identity.UI.csproj
@@ -6,7 +6,6 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <PackageTags>aspnetcore;identity;membership;razorpages</PackageTags>
-    <EnableApiCheck>false</EnableApiCheck>
     <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
     <ProvideApplicationPartFactoryAttributeTypeName>Microsoft.AspNetCore.Mvc.ApplicationParts.NullApplicationPartFactory, Microsoft.AspNetCore.Mvc.Core</ProvideApplicationPartFactoryAttributeTypeName>
   </PropertyGroup>
diff --git a/src/UI/baseline.netcore.json b/src/UI/baseline.netcore.json
new file mode 100644
index 0000000000..7a73a41bfd
--- /dev/null
+++ b/src/UI/baseline.netcore.json
@@ -0,0 +1,2 @@
+{
+}
\ No newline at end of file