If anyone has any trouble on getting your microphone to work on any of the microphone-powered Windows games in the jam, make sure you do the following (feel free to copy this to your page if you've submitted a microphone-powered game):
1. Go to Start menu -> Settings -> Microphone Privacy Settings (type it in that settings search bar).
2. Make sure the toggle for "Allow apps to access your microphone" to on. See below:
Also, you can preselect your default microphone too:
1. Go to the Start Menu -> Settings -> System -> Sound
2. Choose your input device. Make sure it is a real microphone and not some virtual mic like "Oculus Virtual Audio Device".