Mic not showing in Macbook


The virtual microphone not showing in MacOS . In Catalina it seems to work (different machine tho). Does anyone have the same problem? Is there a way to fix this?

Thanks in advance.

Apologies; I will try to be clearer.

The mic is a NW700, the audio audio interface is NW100.
The XLR lead from the NW100 terminates in a 3.5mm jack. To get it into the Macbook I have a 3.5 to usb adaptor as the jack cannot be plugged directly into the mac (2 ring/3 ring issue).
The lead from the mic terminates in xlr.

I do have two other condenser mics : Sony ECM-MSD1 and Phillips SBC ME670. They both terminate in a jack. I have tried both these with same outcomes.

If I plug any mic into the mac and open Audacity, it sees the option to select the usb mic but when I do so no recording - no reaction on the meters, nothing.

So the mac and other software is seeing the usb mics when plugged in but somehow they do not work…I have used online mic test and the usb mic is detected but does not work.