Go to the Apple Music app on your device. Make sure you are signed in and that songs supposedly in your Library are actually there.

You might also check your Apple Music subscription status. If you are a member in a family plan owned by someone else then you may not have complete account access.

This usually happens when the Apple Music account isn’t fully synced with Sonos. Try these steps:

Sign out and back in to Apple Music in both the Sonos app and iOS Settings.

Check region settings: Ensure your Apple ID region matches the Sonos region.

Update all software: Make sure iOS, Sonos app, and speaker firmware are up to date.

Remove and re-add the service: In Sonos, remove Apple Music, then add it again.

Network check: Ensure your phone and Sonos are on the same network.

If it still shows “No items available,” contacting Sonos support is recommended — sometimes the issue is on their Apple Music integration side.

Thanks Ayana

I have taken all steps you list. And contacted Sonos but the lady there was unable to help. The problem persists. 
regards, Cormac