diff --git a/internal/controlplane/handlers_authz.go b/internal/controlplane/handlers_authz.go
index 7f2229c57e..758c6d0ef9 100644
--- a/internal/controlplane/handlers_authz.go
+++ b/internal/controlplane/handlers_authz.go
@@ -206,7 +206,8 @@ func getDefaultProjectID(
 	}
 
 	if len(prjs) != 1 {
-		return uuid.UUID{}, util.UserVisibleError(codes.PermissionDenied, "Cannot determine default project. Please specify one.")
+		return uuid.UUID{}, util.UserVisibleError(codes.PermissionDenied, "Multiple project found, cannot "+
+			"determine default project. Please explicitly set a project and run the command again.")
 	}
 
 	return prjs[0], nil