I have been recording on Audacity using the fifine microphone on my old Mac 10.3 (Linux) and it has been successful. Now when I opened Audacity to record something, all of the sudden, it won’t pick up my microphone! Why is this happening? I didn’t do anything stupid to my microphone or Audacity! I tried everything! I tried restarting the program, I tried rescanning the audio device, I tried fixing my settings, and nothing worked! What should I do? If I don’t get help soon, I will call the police on whoever made Audacity!
So this could be as simple as a MacOS microphone permissions setting. See: Control access to the microphone on Mac – Apple Support (UK)