diff --git a/l1/app/__init__.py b/l1/app/__init__.py
index 408983b..3b945b3 100644
--- a/l1/app/__init__.py
+++ b/l1/app/__init__.py
@@ -170,7 +170,7 @@ def create_app() -> FastAPI:
         from artdag_common.fragments import fetch_fragments as _fetch_frags
 
         user = get_user_from_cookie(request)
-        auth_params = {"email": user.email} if user and user.email else {}
+        auth_params = {"email": user.email or user.username} if user else {}
         nav_params = {"app_name": "artdag", "path": path}
 
         try:
diff --git a/l2/app/__init__.py b/l2/app/__init__.py
index 1062a13..add533b 100644
--- a/l2/app/__init__.py
+++ b/l2/app/__init__.py
@@ -58,7 +58,7 @@ def create_app() -> FastAPI:
         from artdag_common.fragments import fetch_fragments as _fetch_frags
 
         user = get_user_from_cookie(request)
-        auth_params = {"email": user.email} if user and user.email else {}
+        auth_params = {"email": user.email or user.username} if user else {}
         nav_params = {"app_name": "artdag", "path": path}
 
         try: