This is for anyone else who’s microphone stops working after the update.
After updating to Windows 10 version 1803 my Yeti microphone stopped working. Device manager and control panel says everything is fine. Very frustrating but I did find a fix you have to do Settings -> Privacy -> Microphone -> ‘Allow apps to access this microphone’ it’s the only fix I found but it works. Oh and also make sure the default input device is set correct in Mumble.