Seems like I am in the same boat with so many others.  I have 7 Sonos One SLs and Apple Music will no longer play.  I was looking to purchase the surround 7.1.2 setup, but this has completely turned me off of getting it.  Seems like app updates can render your speakers useless.  Or at least useless for your primary use.  I miss the time when things weren’t so reliant on connection.  I have tried to reauthorize with no success…i can see the service and pick the playlist, but it just spins.  Any help/workaround is appreciated. 
Sonos, try some beta testing before crippling the users.