My Sonos Beam and speakers playing through the AppleTV were working before I updated the AppleTV to tvOS 12, and the iPhone / iPad to iOS 12. I can only play to Sonos via the Sonos app. If I try to play through the ATV or the iPhone / iPad, I get a message that it won't connect to the "Living Room". I've only restarted the iOS devices.
Other than some simple troubleshooting, I am trying to understand why this has happened. My wi-fi has not changed. I may have to reset my whole Sonos system and start over (not a problem for me). Just looking for some input if anyone else has similar problems.
Best answer by chrobison
Fixed it. Restarting the Sonos Beam made all the difference. I feel a little silly. I do tech support for a living.
Of course it was later in the evening when all this occurred.