See this link on how to add a Music service to Sonos:

https://support.sonos.com/en-us/article/add-a-music-service-to-sonos

Also this:

https://support.sonos.com/en-us/services/apple-music

apple music is not listed as a music service.

Check my link for Availability in your location.  If it is available, check your account below.  Make sure your location is correctly entered in your profile info.

https://www.sonos.com/my-account

my location is the UK and is correctly recorded. apple music is not listed as a music service.

Thats unusual, I’m UK aswell, but I’m seeing the Apple Music service (see screenshot attached) - if you’ve just recently changed the Country setting in your online profile, you might have to wait a while. Perhaps try fully closing (slide off screen) and reopening the App too.

checked everything as suggested. apple music is not listed as a music service.

Make sure you use a Sonos ‘mobile’ controller App, rather than the Windows/Mac (desktop) App and ensure the mobile device meets the system requirements shown in this link:

https://support.sonos.com/en-us/article/sonos-app-requirements

If still no joy adding ths music service, you could also go onto reset the Sonos App. See this link…

https://support.sonos.com/en-us/article/reset-the-sonos-app

On reopening the reset App, step through the opening screens, accepting the T&C’s etc. and choose the option to connect back to your ‘existing’ Sonos system. Do not create a new Sonos system.

When complete try adding the service again.

If you still have the issue after trying these things, then it maybe best to submit a Sonos system diagnostic report from within the Sonos App, note it’s reference and then contact/chat with Sonos Support Staff via this LINK and see what the Staff can perhaps suggest to resolve the matter.

Just as a further thought too @really confused, it might also be worth powering off your Sonos speaker(s) and rebooting your router too, just to perhaps get rid of any potential gremlins.