Apple iTunes won't migrate to Sonos app

As the title states, I can't get my iTunes music from my iMac to migrate to the Sonos app on my iPhone 13.

Spent over an hour with Sonos help and they finally said the problem is on the Apple side.

When I try to set up my Apple Music account on the Sonos app, it keeps saying I need to re-authorize but I can't get the authorization to work.

Help???