diff --git a/samples/IdentitySample.Mvc/Startup.cs b/samples/IdentitySample.Mvc/Startup.cs
index 4a8d6338de..1b337c0185 100644
--- a/samples/IdentitySample.Mvc/Startup.cs
+++ b/samples/IdentitySample.Mvc/Startup.cs
@@ -1,7 +1,5 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
+using IdentitySample.Models;
+using IdentitySample.Services;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
@@ -9,11 +7,6 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
-using IdentitySample.Models;
-using IdentitySample.Services;
-using Microsoft.AspNetCore.Identity;
-using Microsoft.AspNetCore.DataProtection;
-using System.IO;
 
 namespace IdentitySample
 {
@@ -68,7 +61,7 @@ namespace IdentitySample
 
             app.UseStaticFiles();
 
-            // To configure external authentication please see http://go.microsoft.com/fwlink/?LinkID=532715
+            app.UseAuthentication();
 
             app.UseMvc(routes =>
             {
diff --git a/src/Microsoft.AspNetCore.Identity/BuilderExtensions.cs b/src/Microsoft.AspNetCore.Identity/BuilderExtensions.cs
index e5136c7bef..7fb473820c 100644
--- a/src/Microsoft.AspNetCore.Identity/BuilderExtensions.cs
+++ b/src/Microsoft.AspNetCore.Identity/BuilderExtensions.cs
@@ -15,7 +15,8 @@ namespace Microsoft.AspNetCore.Builder
         /// </summary>
         /// <param name="app">The <see cref="IApplicationBuilder"/> instance this method extends.</param>
         /// <returns>The <see cref="IApplicationBuilder"/> instance this method extends.</returns>
-        [Obsolete("See https://go.microsoft.com/fwlink/?linkid=845470", error: true)]
-        public static IApplicationBuilder UseIdentity(this IApplicationBuilder app) => app;
+        [Obsolete("See https://go.microsoft.com/fwlink/?linkid=845470")]
+        public static IApplicationBuilder UseIdentity(this IApplicationBuilder app)
+            => app.UseAuthentication(); 
     }
 }
\ No newline at end of file