tl;dr - Connect your FW to your Receiver or TV using the HDMI Expansion card (not a dock or anything else) and see if Audio works through the TV, post the receiver/TV you’re using along with results.
Why? In this thread there were a few people having issues with Audio-Out to TV’s or TV’s via Receivers(/AVR, whatever). Seems to affect both Windows and Linux, 11th gen and 12th gen laptops. It doesn’t look like the issue was resolved and now I find myself having the same issue with my 12th gen. I have a support ticket open but wanted to see if others are affected, or perhaps if someone’s found a cause or solution.