Volume control in game settings

how do i turn ON game sound volume and 3d world volume in zwift
I am on Apple TV gen 5
I rebooted, re-installed and changed settings in apple tv to stereo
Slider is set on max but all is OFF

I had a similar problem with my AppleTV 4K some time ago … change of HDMI cable solved it. Not sure what was “wrong” with the first one (can’t see any difference) - I used another HDMI cable (I have several spares at my home) and everything works fine … “long shot” but maybe worth to try.