See if rebuildling the Spotlight index helps > How to rebuild the Spotlight index on your Mac - Apple Support
I got a MacBook Air a 3 months ago and use the microphone to ask Siri questions regularly. Siri stopped recognizing the built in mic that has been working till now. It is still selected in siri’s Settings and works with other 3rd party apps.
Question marked as Solved
Also - does this behavior survive a restart?
User profile for user: Patmo1212
Question: Siri is not recognizing built in microphone on MacBook air