Awesome to hear!
Normally we use the blue/white pair for the ROV comms, but it should be fine as long as you’ve got the same pair connected on both ends
Is it possible you had different ends connected before? Homeplug (what the fathom-Xs use) is funky AC, so you can sometimes get intermittent signal working across pairs just by cross-talk from within the tether.
Wonderful, keen to see how it goes