Is it you Aaron?
For any midi output over the micro usb port, use the port called "usb device port 1", the last one in the selector.
Midi input should just work, you can't really set a specific input port. Maybe try the object called:
That one shows any midi input, fed to Axoloti.
I think its missing the midi input selector. It would make using several midi controllers with one Axoloti much easier.