I have two Sonos Ones stereo paired and have connected to my Apple TV (running tvOS 15.2) and when I select the Audio output to Living Room (my stereo pair Sonos Ones) I only get sound out of my right speaker. The left speaker is completely silent. This is not an issue when listening to music via the stereo pair on the So is app, just when using Airplay on the Apple TV.
I changed the Apple TV format to Stereo but that didn’t work as well. Wondering if there is a