Mc6 pro thru relay A to tap tempo not "strong" enough?

I’m trying to control the tap tempo of a BOSS DD7. I have two separate trs cables to try. One is 3.5 to 1/4. The other is 1/4 to 1/4 with a 3.5 adapter.
The scenario: I tap my tap tempo on mc6pro. The light on the DD7 pedal flickers with each tap, but doesn’t actually turn green and therefore doesn’t effect tempo. Unless I tap very very fast, then the light will intermittently turn green. I’ve tried this with both a DD7 and the Slicer. I’ve tried separate cables.

The settings are as such on the morningstar video.
I’ve tried 8 tap sequence. Single taps. I’ve tried tip…ring… NO /NC.
Does this sound familiar to anyone?

Hi
the dd’s manual states that you have to use a ts plug. Signal on tip. And afaik boss usually wants to have a momentary switch that’s normally closed (NC)