When a Paragon sync fails, the error code tells you where to look: proxy 401/403 errors mean the connected account credentials or permissions broke (reconnect the account), while the 1xxxx series point at sync configuration or mapping problems. Check the code before re-running the sync.

Context: Paragon documents managed sync error codes including 10001, 10003, 10004, 10005, 10006, 10007, 20005, 00000, plus PROXY_401 and PROXY_403 for proxied requests.