[bashville]

Originally Posted by _JJ_

I think this is what you're looking for. It's for High Sierra but I believe the same steps apply for Mojave and Catalina. The trick may be to NOT hit restart until you've ok'd the installation in the security panel. If you restart first my guess is that the extension is left in the sandbox - or whatever it's called in programming land.

This is a different issue from enabling the microphone thing...

https://www.youtube.com/watch?v=vsVd9kRgFo4

Thanks for this--the interesting thing is I never got that "extension blocked" warning, but that still sounds like the most probable reason my card is not showing up (mounted in a PCI expansion chassis that was approved for the card). I know the card is OK because it works in my other Mac.

At least this video is saying to NOT restart right away after the installation.... I'll certainly get on the phone with Apple support about this, and will post any results here.