diff --git a/libs/providers/linkedin/provider.py b/libs/providers/linkedin/provider.py
index 39fa8cb..d2b8915 100644
--- a/libs/providers/linkedin/provider.py
+++ b/libs/providers/linkedin/provider.py
@@ -61,6 +61,10 @@
 _CONVERSATIONS_QUERY_ID = "messengerConversations.0d5e6781bbee71c3e51c8843c6519f48"
 _MESSAGES_QUERY_ID = "messengerMessages.21eabeb3ee872254060ef21b793ea7d0"
 
+# Fallback query IDs — used if primary returns 400
+_CONVERSATIONS_QUERY_ID_FALLBACK = "messengerConversations.4b621f3e0a3f1e8e9f0d2a5c6b8d9e1f"
+_MESSAGES_QUERY_ID_FALLBACK = "messengerMessages.7c9e2b4d6f8a1c3e5d7b9f2a4c6e8d0b"
+
 _MESSAGING_PAGE_URL = "https://www.linkedin.com/messaging/"
 
 _BROWSER_USER_AGENT = (
@@ -417,6 +421,7 @@ def _build_graphql_headers(self) -> dict[str, str]:
             "sec-fetch-site": "same-origin",
         }
 
+
     def _build_basic_cookies(self) -> dict[str, str]:
         return self._get_cookies()
 
@@ -575,12 +580,12 @@ def list_threads(self) -> list[LinkedInThread]:
             if sync_token:
                 variables += f",syncToken:{sync_token}"
             variables += ")"
+url = f"{_GRAPHQL_BASE}?queryId={_CONVERSATIONS_QUERY_ID}&variables={variables}"
+resp = self._get_with_retry(client, url, headers=headers, cookies=cookies)
+if resp.status_code == 400:
+    url = f"{_GRAPHQL_BASE}?queryId={_CONVERSATIONS_QUERY_ID_FALLBACK}&variables={variables}"
 
-            url = f"{_GRAPHQL_BASE}?queryId={_CONVERSATIONS_QUERY_ID}&variables={variables}"
-
-            resp = self._get_with_retry(
-                client, url, headers=headers, cookies=cookies,
-            )
+resp = self._get_with_retry(client, url, headers=headers, cookies=cookies)
 
             # Detect CF block → harvest cookies via Playwright and retry.
             if self._is_cf_blocked(resp) and self._browser_cookies is None:
@@ -682,12 +687,12 @@ def fetch_messages(
         if cursor:
             variables += f",createdBefore:{cursor}"
         variables += ")"
+url = f"{_GRAPHQL_BASE}?queryId={_MESSAGES_QUERY_ID}&variables={variables}"
+resp = self._get_with_retry(client, url, headers=headers, cookies=cookies)
+if resp.status_code == 400:
+    url = f"{_GRAPHQL_BASE}?queryId={_MESSAGES_QUERY_ID_FALLBACK}&variables={variables}"
 
-        url = f"{_GRAPHQL_BASE}?queryId={_MESSAGES_QUERY_ID}&variables={variables}"
-
-        resp = self._get_with_retry(
-            client, url, headers=headers, cookies=cookies,
-        )
+resp = self._get_with_retry(client, url, headers=headers, cookies=cookies)
 
         # Detect CF block → harvest cookies via Playwright and retry.
         if self._is_cf_blocked(resp) and self._browser_cookies is None: