diff --git a/src/Authentication.Abstractions/AzureEnvironment.cs b/src/Authentication.Abstractions/AzureEnvironment.cs
index d4fb1126c5..d70c421b6b 100644
--- a/src/Authentication.Abstractions/AzureEnvironment.cs
+++ b/src/Authentication.Abstractions/AzureEnvironment.cs
@@ -55,6 +55,8 @@ static IDictionary<string, AzureEnvironment> InitializeBuiltInEnvironments()
             azureCloud.SetProperty(ExtendedEndpoint.OperationalInsightsEndpointResourceId, AzureEnvironmentConstants.AzureOperationalInsightsEndpointResourceId);
             azureCloud.SetProperty(ExtendedEndpoint.AnalysisServicesEndpointSuffix, AzureEnvironmentConstants.AzureAnalysisServicesEndpointSuffix);
             azureCloud.SetProperty(ExtendedEndpoint.AnalysisServicesEndpointResourceId, AzureEnvironmentConstants.AzureAnalysisServicesEndpointResourceId);
+            azureCloud.SetProperty(ExtendedEndpoint.AzureAttestationServiceEndpointSuffix, AzureEnvironmentConstants.AzureAttestationServiceEndpointSuffix);
+            azureCloud.SetProperty(ExtendedEndpoint.AzureAttestationServiceEndpointResourceId, AzureEnvironmentConstants.AzureAttestationServiceEndpointResourceId);
             var azureChina = new AzureEnvironment
             {
                 Name = EnvironmentName.AzureChinaCloud,
@@ -307,7 +309,9 @@ public static class ExtendedEndpoint
             public const string OperationalInsightsEndpointResourceId = "OperationalInsightsEndpointResourceId",
                 OperationalInsightsEndpoint = "OperationalInsightsEndpoint",
                 AnalysisServicesEndpointSuffix = "AzureAnalysisServicesEndpointSuffix",
-                AnalysisServicesEndpointResourceId = "AnalysisServicesEndpointResourceId";
+                AnalysisServicesEndpointResourceId = "AnalysisServicesEndpointResourceId",
+                AzureAttestationServiceEndpointSuffix = "AzureAttestationServiceEndpointSuffix",
+                AzureAttestationServiceEndpointResourceId = "AzureAttestationServiceEndpointResourceId";
         }
     }
 }
diff --git a/src/Authentication.Abstractions/AzureEnvironmentConstants.cs b/src/Authentication.Abstractions/AzureEnvironmentConstants.cs
index b1113b7eb7..3562953ef9 100644
--- a/src/Authentication.Abstractions/AzureEnvironmentConstants.cs
+++ b/src/Authentication.Abstractions/AzureEnvironmentConstants.cs
@@ -171,5 +171,15 @@ public static class AzureEnvironmentConstants
         public const string ChinaAnalysisServicesEndpointResourceId = "https://region.asazure.chinacloudapi.cn";
         public const string USGovernmentAnalysisServicesEndpointResourceId = "https://region.asazure.usgovcloudapi.net";
         public const string GermanAnalysisServicesEndpointResourceId = "https://region.asazure.cloudapi.de";
+
+        /// <summary>
+        /// The domain name suffix for Azure Attestation Services
+        /// </summary>
+        public const string AzureAttestationServiceEndpointSuffix = "attest.azure.net";
+
+        /// <summary>
+        /// The token audience for authorizing Attestation Service requests
+        /// </summary>
+        public const string AzureAttestationServiceEndpointResourceId = "https://attest.azure.net";
     }
 }
diff --git a/src/Authentication.Abstractions/Extensions/AzureEnvironmentExtensions.cs b/src/Authentication.Abstractions/Extensions/AzureEnvironmentExtensions.cs
index c4e91b2394..7072ae130d 100644
--- a/src/Authentication.Abstractions/Extensions/AzureEnvironmentExtensions.cs
+++ b/src/Authentication.Abstractions/Extensions/AzureEnvironmentExtensions.cs
@@ -277,6 +277,12 @@ public static void SetEndpoint(this IAzureEnvironment environment, string endpoi
                     case AzureEnvironment.ExtendedEndpoint.AnalysisServicesEndpointResourceId:
                         environment.SetProperty(AzureEnvironment.ExtendedEndpoint.AnalysisServicesEndpointResourceId, propertyValue);
                         break;
+                    case AzureEnvironment.ExtendedEndpoint.AzureAttestationServiceEndpointSuffix:
+                        environment.SetProperty(AzureEnvironment.ExtendedEndpoint.AzureAttestationServiceEndpointSuffix, propertyValue);
+                        break;
+                    case AzureEnvironment.ExtendedEndpoint.AzureAttestationServiceEndpointResourceId:
+                        environment.SetProperty(AzureEnvironment.ExtendedEndpoint.AzureAttestationServiceEndpointResourceId, propertyValue);
+                        break;
                 }
             }
         }
@@ -312,6 +318,10 @@ public static string GetTokenAudience(this IAzureEnvironment environment, string
                 case AzureEnvironment.ExtendedEndpoint.AnalysisServicesEndpointResourceId:
                     resource = AzureEnvironment.ExtendedEndpoint.AnalysisServicesEndpointResourceId;
                     break;
+                case AzureEnvironment.ExtendedEndpoint.AzureAttestationServiceEndpointSuffix:
+                case AzureEnvironment.ExtendedEndpoint.AzureAttestationServiceEndpointResourceId:
+                    resource = AzureEnvironment.ExtendedEndpoint.AzureAttestationServiceEndpointResourceId;
+                    break;
                 default:
                     resource = AzureEnvironment.Endpoint.ActiveDirectoryServiceEndpointResourceId;
                     break;