Hi there rickrocket19,
Thank you for using Apple Support Communities!
It sounds as though when playing content on Apple TV+ using your Apple TV connected to a Sonos Arc device you’re not able to hear any sound.
You’re in the right place, we’d be glad to assist in seeking a solution.
We’d advise checking to see if the Quick Start setting is turned on as this disables Dolby Atmos sound. Below is a resource that can provide steps and additional information:
Change iTunes movie and TV show settings on Apple TV
We’d also advise checking out this resource below for further information on playing audio in Dolby Atmos:
Play audio in Dolby Atmos or surround sound on your Apple TV
We hope this helps,
Cheers!