If your Steam microphone is not working, check if you have configured your microphone correctly. Here are some fixes that may help you.

However, my Windows 10 will not see a connected mic even though my Via onboard sound (driver 6.0.11.0800) detects it being plugged in (but then doesn't show it).

Windows 11 now supports super wideband stereo audio over Bluetooth LE Audio during game chat and voice calls. Windows 11 just ...