In order for WorshipTools to access SongSelect, the church needs to sign in to SongSelect from within WorshipTools using a valid CCLI Profile login. These logins often belong to a specific individual that serves at the church. When that individual leaves their position, they may be removed from the CCLI user list. This is what causes the link from WorshipTools to CCLI to sever, causing the Authentication Error.
To fix this issue, you'll need to be an Organization Administrator on the WorshipTools account. If you are not an Org Admin, please contact your Org Admin for help.
Open Music Stand and head to the Settings page. You can get there from the Music Stand home screen by tapping the three dots in the upper right corner. On the Settings pop-up, look for Integrations. Disconnect the current CCLI connection. This will remove the CCLI login that belongs to the individual who no longer attends your ministry. Then, reconnect with an active CCLI login. This will re-establish the connection between the two programs so that you can return to importing songs from SongSelect without issue. You can also fix this error in Presenter.
For any SongSelect support, please contact CCLI directly.