Hi!
I have a Sonos amp in my outside patio and two Sonos Ones as a stereo pair in my living room. I used to be able to group them all directly on my iPhone with my Apple TV that is connected to a receiver in another room, and they would a play music in the whole apartment. That option stopped working all of a sudden. I did a little googling and found about this “Group non-AirPlay Products option” so I anxiously went to check… but in my Sonos app that switch is greyed out and I can’t toggle it. Can someone please help?