EDIT 11/28/2020 - Once again ESPN has changed their authentication API so any new ESPN logins via LeagueSync are not working. Our developers are working on this issue.
This article is specific to troubleshooting LeagueSync on 4for4.com (not the app).
Try This First
When you're about to sync, logout of the site (ESPN in the screenshot below) from LeagueSync.
Click the Logout button then resyncing again. This re-connection process normally fixes any errors.
Site specific issues
- ESPN can take up to 60 seconds for the connection to process to complete.
- ESPN LeagueSync tends to work better when there are no special characters in the password
- RTSports will only accept e-mail address as the user id.
If All Else Fails...