Did you go to sound input and select a mic? You may need a mono to stereo plug adapter because my Denon mic has a mono plug. Mac may be looking for headphones.
While I was waiting for my UMIK, I just used the built in microphone on my MacBook.
Buy a UMIK-1, it’s worth it. I just bought one last week and it completely changed my sub placement and EQ.
I have a MacBook Air M1 from 2020. A UMIK-1 plugs right into USB-C