Fixes #2410, #2410 (#2499)

* Fixes #2410

src/Microsoft.Identity.Web.TokenAcquisition/ServiceCollectionExtensions.cs

@@ -42,7 +42,7 @@ public static IServiceCollection AddTokenAcquisition(
             _ = Throws.IfNull(services);
 
 #if !NETSTANDARD2_0 && !NET462 && !NET472
-            bool forceSdk = !services.Any(s => s.ServiceType == typeof(AspNetCore.Hosting.IWebHostEnvironment));
+            bool forceSdk = !services.Any(s => s.ServiceType.FullName == "Microsoft.AspNetCore.Authentication.IAuthenticationService");
 #endif
 
             if (services.FirstOrDefault(s => s.ImplementationType == typeof(ICredentialsLoader)) == null)

tests/Microsoft.Identity.Web.Test/TestTokenAcquisitionHost.cs

@@ -0,0 +1,46 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System.Linq;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+
+namespace Microsoft.Identity.Web.Test
+{
+    public class TestTokenAcquisitionHost
+    {
+        [Fact]
+        public void TestTokenAcquisitionHostNotAspNetCore()
+        {
+            // When not adding Services.AddAuthentication, the host should be 
+            TokenAcquirerFactory tokenAcquirerFactory = TokenAcquirerFactory.GetDefaultInstance();
+            var host = tokenAcquirerFactory.Services.First(s => s.ServiceType.FullName == "Microsoft.Identity.Web.ITokenAcquisitionHost");
+            Assert.True(host.ImplementationType!.FullName == "Microsoft.Identity.Web.Hosts.DefaultTokenAcquisitionHost");
+        }
+
+        [Fact]
+        public void TestTokenAcquisitionAspNetCoreBuilderNoAuth()
+        {
+            // When not adding Services.AddAuthentication, the host should be 
+            var builder = WebApplication.CreateBuilder();
+            builder.Services.AddTokenAcquisition();
+            var host = builder.Services.First(s => s.ServiceType.FullName == "Microsoft.Identity.Web.ITokenAcquisitionHost");
+            Assert.True(host.ImplementationType!.FullName == "Microsoft.Identity.Web.Hosts.DefaultTokenAcquisitionHost");
+        }
+
+
+        [Fact]
+        public void TestTokenAcquisitionAspNetCoreBuilderAuth()
+        {
+            // When not adding Services.AddAuthentication, the host should be 
+            var builder = WebApplication.CreateBuilder();
+            builder.Services.AddAuthentication()
+                .AddMicrosoftIdentityWebApi(builder.Configuration)
+                 .EnableTokenAcquisitionToCallDownstreamApi();
+
+            var host = builder.Services.First(s => s.ServiceType.FullName == "Microsoft.Identity.Web.ITokenAcquisitionHost");
+            Assert.True(host.ImplementationType!.FullName == "Microsoft.Identity.Web.TokenAcquisitionAspnetCoreHost");
+        }
+    }
+}