Hi ! Like other people in the comments my microphone don't work in the game (yes I made the right mic the default mic in my Windows settings).
It looks like the problem apears from months ago according to the comments. this is not a derogatory remark It just a deduction don't worry, even if I'm not a game developer I know that it may be difficult to fix some types of bugs.
The game seems to be a good one so I wish it to be functional so I can play it :)