diff --git a/server.py b/server.py
index ea79e53..68e35aa 100644
--- a/server.py
+++ b/server.py
@@ -410,6 +410,7 @@ def _verify_token_with_l2_sync(token: str, l2_server: str) -> Optional[str]:
         resp = http_requests.post(
             f"{l2_server}/auth/verify",
             headers={"Authorization": f"Bearer {token}"},
+            json={"l1_server": L1_PUBLIC_URL},  # Identify ourselves to L2
             timeout=5
         )
         if resp.status_code == 200: