MC6 Pro and Meris Mercury 7 issues

I’m encountering a strange problem between my MC6 Pro and Mercury7 (connected via TRS). When I send CC changes, they take effect on the Meris. I can turn the pedal off and on with CC. However, it’s not responding to PC messages.

I have the Meris set to midi channel 3, expression input set to midi. Omniport 1 on the MC6p set to Midi Out Tip Active. I can see the the PC messages are being sent through the midi monitor on the web app.