I had my Sonos years - Play 5 as stereo pair. Gen 1 and now gen 2. This process has not been with out issues. Now again - I have gone weeks with it being completely non-functional from an apple perspective, no changes have been made to my set up. When I try to play a song from Apple Music, it would sometimes start and play the first 10 seconds and then stop and say that it cannot connect to Apple Music or it may say this from the start. Other times I will try to add a song and it just says "cannot add music to queue" I have power cycled the speakers, the modem, the wifi. Nothing seems to make any difference. I have installed the app and re installed - I have checked all settings. The Tunein-radio works, Sonos radio works, my line in to my turntable works - this is specifically an issue between the sonos and apple interface.
Everything else in my house works. I can stream 4k video in any room in the house. I can stream apple music from several different appliances in my house. (JBL, Sony, Bose, Marshall and several headsets and ear buds/pods.
Diagnostic number. 868555357