Significant Apple Music Sync issues Sequoia 15.3.2 - No Music Subscription, just my library

Recently upgraded iMac and iPhone to latest version (iMac 15.3.2 and iPhone 18.3.2) and noticed that there were some differences in artwork, specifically with playlist headers, where the iMac and iPhone were not even close.

I followed some community guidance and relaunched the app on both devices, even reset the devices, logged out of my account on both and tried to re-sync and have also removed the Music app from device, reloaded and re-synced

This time I noticed that a lot of my own playlists on my iMac have had all of their songs removed and I am left with empty playlists (Thanks!). So after rebuilding some of them and continually trying to re-sync I am left with the following issues:

• Some Playlists with multiple songs on my iMac but only showing single songs on my iPhone, or none!
• Playlists with all of the songs on both, but a large majority greyed out, with the error 'This item is not currently available in your country and or region' (Have have checked my region in both devices and they are correct
• The re-sync process goes through steps 1-4 and yet it does obviously show copying files
• The artwork is now literally all over the place (not even close to matching)

Any suggestions