I was able to connect my Sonos Beam to my Hisense Roku tv but there is no sound.
It's connected through the ACR port and shows up in the CEC settings and the Sonos app says the tv is connected but there is no sound coming from the tv and the roku remote doesn't control the volume level.
We are experiencing the same thing. If sonos is disconnected tv has audio, plug in the sonos beam to hdmi arc and we lose sound. Can reset the tv audio video and the sound returns until the next time we turn it off.