Does this help?, add albums from ios APM app to My Library:
Log into Sonos.com, edited my account profile. Left my Address exactly as it was (UK address + post code) but just flipped the country over to US. Then shut down my sonos controller app, waited for a few minutes, and now when I go to add a new Service link in Sonos, there are two Amazons in there, a grey one (the one I had) called "Sign in with Amazon Music Library" and an orange one (new) called "Sign in with Amazon Music". I added the orange one and it gave me a link to open in my browser which then asked for permission for Sonos to access my Amazon Music Library.
Once the service was added, I can see two items in there - "Prime Music" and "Your Library" and when I click them I see exactly - absolutely everything I see in the Amazon music desktop app. Awesome!
