diff --git a/src/Identity/Utilities/ServiceCollectionExtensions.cs b/src/Identity/Utilities/ServiceCollectionExtensions.cs
index 1476a5ec76..388dec1103 100644
--- a/src/Identity/Utilities/ServiceCollectionExtensions.cs
+++ b/src/Identity/Utilities/ServiceCollectionExtensions.cs
@@ -55,7 +55,8 @@ public static class ServiceCollectionExtensions
             .AddResourceOwnerValidator<ResourceOwnerPasswordValidator>()
             .AddClientStore<DynamicClientStore>()
             .AddIdentityServerCertificate(env, globalSettings)
-            .AddExtensionGrantValidator<WebAuthnGrantValidator>();
+            .AddExtensionGrantValidator<WebAuthnGrantValidator>()
+            .AddExtensionGrantValidator<SendAccessGrantValidator>();
 
         if (!globalSettings.SelfHosted)
         {