I have been using Apple Music service in Sonos App fine to play music library on my iPhone. I was told recently that Sonos app needed to be updated which I did. Now I get continuing looping message that Apple Music access has expired. Reauthorised. 
i reauthorise but keep getting message. I have removed service and add again. I have deleted Sonos app and reinstalled the add service again but still not working.

chatted online with Sonos support and was told I need to pay Apple Music subscription to get service to which I said was not correct as it was working fine before Sonos app update.

i can use Apple Music app fine standalone only get this problem using it as a service within Sonos app.