⌘ + r › ms-settings:privacy-microphone
Leave Microphone enabled. See 1803 update breaks microphone.
See Determining App List to generate a list of apps for more fine grained control of app access.
10.9.1. Allow apps to access your microphone
Allow apps to access your microphone
GPO policy allow defines desktop and store app access.
Computer Configuration › Administrative Templates › Windows Components › App Privacy › Let Windows access the microphone
Default for all apps
User is in control