diff --git a/apps/api/src/services/telegram_gateway.py b/apps/api/src/services/telegram_gateway.py
index ad3910b6..0fb4db77 100644
--- a/apps/api/src/services/telegram_gateway.py
+++ b/apps/api/src/services/telegram_gateway.py
@@ -1378,6 +1378,14 @@ class TelegramGateway:
         ) as span:
             try:
                 response = await self._http_client.post(url, json=payload)
+                if response.status_code >= 400:
+                    import json as _json
+                    _payload_str = _json.dumps(payload, ensure_ascii=False)
+                    logger.error("telegram_api_rejected", method=method,
+                                 status=response.status_code,
+                                 response_body=response.text[:300],
+                                 payload_len=len(_payload_str),
+                                 payload_preview=_payload_str[:1000])
                 response.raise_for_status()
                 result = response.json()