Interesting. Are you using USB MIDI or with the TRS cable? Not sure if the SQ64 does or doesn't send MIDI over USB, but Axoloti recognizes my Minilogue xd through USB. It should recognize the TRS MIDI by default.
If you're trying with a MIDI Din to TRS adapter and it's not working, did you by chance order it off of Amazon? I bought one for another reason and I hadn't seen the reviews that it was falsely advertised. It was 5 pin DIN, but was wired for old testing equipment or something.