diff --git a/src/core/server/graph/tenant/schema/schema.graphql b/src/core/server/graph/tenant/schema/schema.graphql
index a3085b32f..f53f642eb 100644
--- a/src/core/server/graph/tenant/schema/schema.graphql
+++ b/src/core/server/graph/tenant/schema/schema.graphql
@@ -361,7 +361,7 @@ type User {
   """
   username is the name of the User visible to other Users.
   """
-  username: String!
+  username: String
 
   """
   displayName is provided optionally when enabled and available.