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I don't know what it is but I don't get sound on mine, at least for most games.
Sometimes my pc gets confused on which sound output it's supposed to use. Have you tried alt-tabbing out of the game on your pc and setting the sound output to the steam link?
It's been some time so I don't remember what I tried. I'll give it another try some time.
After seeing this post, I got my Link out and tried it. I initially didn't have sound either, but this comment on the bad site helped me resolve it. TLDR: re-installing the steam speaker driver thing.
https://www.reddit.com/r/OculusQuest/comments/18852nj/comment/kbj5cwc/
It's dumb, but sometimes windows refuses to acknowledge that audio can work if you don't have an audio device currently "active".
On my old computer I just plugged a headphone extender into the back and that fixed it, since it saw there was a connected audio device, even though there weren't even headphones attached.
I'm sure there was a better fix, but a cable on the back wasn't really bothersome.