I still have the problem even after a total reset with TVos 17.1. Worked mostly before update to iOS17, sometimes I had to power it off and on again for it to work again. But after iOS 17 and also 17.1. update no volume and mute switch working anymore with my LG TV. I also turned the TV's CEC se4ttings off and on again. Did a power off etc. Nothing workling. Quite annyoing. And don't know what to do.
4K ATV from last generation with silver siri remote here. iPhone volume control also not working while using it as a ATV remote.