My phone is on iOS 17.1.1 and my AppleTV 4K third Gen and Second gen both on different TVs (both updated to17.1), my phone remote app will not control the volume, it adjusts the volume as if it’s doing it for the phone only. The actual AppleTV remote works for volume up and down just fine. I typically use my phone so I don’t have to track down the AppleTV remote that always hides due to its small size. Anyone have a workaround or any ideas? I’ve reset everything several times, verified software is updated. This seems to happen off/on periodically for no apparent reason. e(ARC) is enabled in settings on the TV and the Apple TV. I’ve tried different cables, different settings nothing seems to work. It almost seems like it’s a setting or issue on the phone.
In the vast majority of cases most TVs don’t allow the functionality of controlling the volume over HDMI CEC, as you’ve already noticed it generally only works with an audio receiver in the chain.
It does work sometimes though. The appleTV supports this functionality.