MIDI issues - Oxygen Pro Mini & Korg EMX-1

I have an Oxygen Pro Mini running into a Korg EMX-1.

It’s the 1/8” TRS MIDI from the midi out on the OPM to the 4 pin MIDI in on the EMX-1. Channels seem to match on both units, but it still seems like signal isnt sending from the pro mini to the EMX-1.

Other controllers work properly. It just seems to be this one.

Does anyone have any recommendations?