Have a friend using Solus Plasma, everything is up to date. Team Fortress 2 runs great on native. His microphone works fine in other games/apps, and it works fine in the TF2 menu... but it doesn't work in the game. He's made sure he's not muted and is using the correct key to talk in game. I see that this is a common bug, and it appears that it plagues pretty much every OS in some manner or another. Has anyone figure out how to make it work?
I did suggest he try to use Proton, just to rule that out.