diff --git a/sync/clients/sync.py b/sync/clients/sync.py
index 1ae8567..2c41bc0 100644
--- a/sync/clients/sync.py
+++ b/sync/clients/sync.py
@@ -58,16 +58,17 @@ def __init__(
     )
     def auth_flow(self, request: httpx.Request) -> Generator[httpx.Request, httpx.Response, None]:
         with self._sync_lock:
-            # fetch with retry and exponential backoff
-            response = yield self.build_auth_request()
-            if response.status_code == httpx.codes.OK:
-                self.update_access_token(response)
-            elif response.status_code in self.retryable_status_codes:
+            if not self.cached_token.is_access_token_valid:
+                # fetch with retry and exponential backoff
+                response = yield self.build_auth_request()
+                if response.status_code == httpx.codes.OK:
+                    self.update_access_token(response)
+                elif response.status_code in self.retryable_status_codes:
+                    raise TryAgain()
+                else:
+                    logger.error(f"{response.status_code}: Failed to authenticate")
+            if not self.cached_token.is_access_token_valid:
                 raise TryAgain()
-            else:
-                logger.error(f"{response.status_code}: Failed to authenticate")
-        if not self.cached_token.is_access_token_valid:
-            raise TryAgain()
         request.headers["Authorization"] = f"Bearer {self.cached_token.access_token}"
         yield request