Macbook M1 MacOS 12.4 BlackHole 16 and 64
Audacity 3.1.3. No sound getting to Audacity as input. In Sys Settings I have given Audacity access to Microphone.
I have used Audacity for years to record internal music using Soundflower and BlackHole.
As a strategy, I even tried skipping the Multi Output, and used BH for both in and out. Nothing.
I then tried another audio recording app, EasyAudioRecorder. It worked straight away.