I currently have a support ticket open with them, because there's no legitimate reason why this wouldn't work with Logic. And I tried purchasing a second Audio Interface as well from a different company and had the same result.
I'm currently either thinking that the problem either lies with Logic or (and unfortunately, more likely for me) between the keyboard and the chair. 🥴
But I've got tickets open with both companies, and it should work just fine.
Currently the only workaround that I've found has been to record the audio in the DAW inside of AmpliTube5, and then export the audio file and drop it into Logic... it's a little ridiculous that I have had to do this so far, but it's been a useful workaround while I wait for a response from IK Mulitimedia.
I've also got a support call with the Logic Pro Team tonight to see if they can point me in the right direction... Will let you know what I find out.