Microphone.interface recognized, but no sound

Audacity (3.0) recognizes the interface I’m using for my mic, but there’s no sound. “Sound” in the computer’s (Catalina 10.15) system preferences does recognize both the interface and the changing levels from the mic. Any advice? Thank you!

What happens when you try to record? Do you get a dialog saying you need to give Audacity permission to use the “microphone”? In System Preferences > Security and Privacy > Privacy when you select the Microphone in the list on the left, is Audacity listed on the right with a check-box checked?
– Bill