Troubleshooting Zoom Sync Failure

Error Response: 401 Unauthorized with error response {"code":124,"message":"Invalid access token."} for url=https://api.zoom.us/v2/users. Inner Error: Error calling refreshAccessTokenFn with Response {"reason":"Invalid Token!","error":"invalid_grant"}

Refresh tokens expire after 15 years, but it can only be used once to get the next refresh token. The latest refresh token must always be used for the next refresh request. Support - Zoom Developers

The solution is - Sync the Zoom app with re-authentication.