How to finish setup an Apple TV remote with sonos if in has no mute button?
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My solution was on the Apple TV to tell it to control "Sonos via IR" as a receiver... I didn't have to program anything on my Sonos to allow the Apple TV remote to control the volume.
I got it to work by playing a little trick. When the Sonos asked me to press mute on remote three times, I clicked in between the + - button making it think it was a mute button. The volume up,and down works. No mute, but it's something.