I have youtube premium and added my account to the services. None of my playlists have ever been synced in the sonos app. I had given up and just used the sonos search to find music. Recently a playlist I added in ytmusic app appeared on my sonos app under YouTube > library. This got me thinking if only new playlists were imported. I tested this by creating couple new playlists but that didn't prostate into the sonod app. I gave it 24hrs.
After searching on here, I followed the advice to remove the account and reconfigure it and re-authorise it. Now sonos doesn't even recognise that my account is premium so I'm worse off.
I've attached some screenshots to give an idea. What am I doing wrong?