Oops! I always browse the forum using the "New Posts" or "Unanswered Threads" filters, so sometimes I forget to check the sub-forum ?
But can't you just say, "Hey, Siri, turn up the volume" like you can with music, etc? I guess that's a bit awkward, though, if you have another person actively on the line, since there's no way to mute your mic from the AirPods themselves. It sure would be cool if Apple allowed you to adjust the volume by sliding your finger up and down the stem button.