Maybe same issue here. Suddenly we've got an error and cannot sync, but our license expires on 2019/5/30.
Just in case we renewed our license and restarted MS, but still got same error.
Sync cannot run due to licensing problem; please contact support@360works.com for assistance: Your license covers products released up to 2018/05/30, but the release date is 2018/08/05. Renew your license at http://360works.com/renew