diff --git a/backend/auth.py b/backend/auth.py
index 918b5eb..012e6ac 100644
--- a/backend/auth.py
+++ b/backend/auth.py
@@ -90,7 +90,9 @@ def require_auth_flexible(x_auth_token: Optional[str] = Header(default=None), to
     Raises:
         HTTPException 401 if not authenticated
     """
+    print(f"[DEBUG] require_auth_flexible: x_auth_token={x_auth_token!r}, token={token!r}")
     session = get_session(x_auth_token or token)
+    print(f"[DEBUG] get_session returned: {session!r}")
     if not session:
         raise HTTPException(401, "Nicht eingeloggt")
     return session