First, I’m having the same issue as several others including ‘uclamba2001’, which is super frustrating. You can’t reply to those posts, so I have to create a brand new one.
My Beam stopped playing TV sound after working fine for well over a year. I tried all the possible steps including restarts, resets, (3) different HDMI cables (yes, incl. brand new), etc.
The HDMI Arc shows the Sonos imagery on screen (so yes, the connection is there), but doesn’t play sound through the TV. I can play music through the app (so yes, the speaker works), but not via TV so my entire home theater system is essentially defunct based on the Beam’s failure.
I didn’t plan on trashing a $1,400 investment, but it seems like I’m out of options.
Good luck to the rest of you.