Mark AzureAuthorityHosts.AzureGermany as Obsolete.

sdk/identity/Azure.Identity/api/Azure.Identity.netstandard2.0.cs

@@ -46,6 +46,7 @@ public AuthorizationCodeCredentialOptions() { }
     public static partial class AzureAuthorityHosts
     {
         public static System.Uri AzureChina { get { throw null; } }
+        [System.ObsoleteAttribute("Microsoft Cloud Germany was closed on October 29th, 2021.")]
         public static System.Uri AzureGermany { get { throw null; } }
         public static System.Uri AzureGovernment { get { throw null; } }
         public static System.Uri AzurePublicCloud { get { throw null; } }

sdk/identity/Azure.Identity/src/AzureAuthorityHosts.cs

@@ -27,6 +27,7 @@ public static class AzureAuthorityHosts
         /// <summary>
         /// The host of the Microsoft Entra authority for tenants in the Azure German Cloud.
         /// </summary>
+        [Obsolete("Microsoft Cloud Germany was closed on October 29th, 2021.")]
         public static Uri AzureGermany { get; } = new Uri(AzureGermanyHostUrl);
 
         /// <summary>

sdk/identity/Azure.Identity/tests/ManagedIdentityCredentialTests.cs

@@ -1113,7 +1113,6 @@ public static IEnumerable<object[]> AuthorityHostValues()
             // params
             // az thrown Exception message, expected message, expected  exception
             yield return new object[] { AzureAuthorityHosts.AzureChina };
-            yield return new object[] { AzureAuthorityHosts.AzureGermany };
             yield return new object[] { AzureAuthorityHosts.AzureGovernment };
             yield return new object[] { AzureAuthorityHosts.AzurePublicCloud };
         }

sdk/identity/Azure.Identity/tests/TokenCredentialOptionsTests.cs

@@ -57,7 +57,7 @@ public void EnvAuthorityHost()
         [Test]
         public void CustomAuthorityHost()
         {
-            string envHostValue = AzureAuthorityHosts.AzureGermany.ToString();
+            string envHostValue = AzureAuthorityHosts.AzureGovernment.ToString();
 
             using (new TestEnvVar("AZURE_AUTHORITY_HOST", envHostValue))
             {