First, please make sure you are using the latest version of the app - 2.4.4. There was a recent version that had a bug with recognizing inputs.
There have been user reports in the past of Ableton interfering with other apps using MIDI interfaces. I would recommend temporarily disabling Ableton to see if that could be causing the issue.
I just checked and I am using version 2.4.4. I also tried both quitting Ableton, as well as restarting my computer, and unfortunately none of my midi interfaces are showing up in the menu. Is there a solution with Audio/Midi. I'm on a mac running 10.13.6