I know there's a way to do this for quest side as well do you know how to do that. I play with allot of my quest friends and it's no fun if they can't also hear
could be you have avatar sounds too low, or you have the sound component in unity too low, or its the mp3 file that is too low byd efault, or even you have the sound object in the hierarchy turned off and the toggle is not turning it on. There's a lot of things that could be the reason