I have two Sonos ONE SL set up in stereo mode in one room, and a Sonos ARC in another room. Both don’t work with AirPlay 2 from a MacBook Pro.
The spakers are set up correctly and I can play using Spotify Connect from the iPhone app and from the Spotify desktop app. There is no audio coming through AirPlay 2 though, no matter what I try the connection is established (as visibile from the app reporting that AirPlay 2 is initiated) but there is no audio at all. Also volume controls and play/pause seem to work, yet no sound. I have submitted diagnostic information # 1477170668.