When I go to Advanced app settings, I can't enable the Enhanced Microsoft SQL Server Connector. I get the error "Your app has a SQL data source - you must first remove any existing SQL data sources before you can toggle this feature". I've opened View > Data sources, and deleted all SQL Server sources. I've also deleted the specific SQL Server connector from Powerapps > Data > Connections. I've left it overnight in case jobs/sync's need to run but the error still appears. I have other connections in other powerapps to SQL Server so I can't remove all SQL Server connections as it will break those apps. Also when I now go to edit the app, I get a permissions issue saying I need to re-add the SQL Server connection, with an 'Allow' button greyed out.
How can I enable this setting?