Thanks @phaedrux.
It appears to be working now. Before my M401 M402 weren't working either. I believe was on heater 3, used two 4 pin connectors (picture attached).
I changed the yellow wire to heater7 and changed the number on the one line of code, and M401 and M402 work as expected. Sending G30 the probe now deploys and the effector starts its descent. Now I can work on finishing the setup.
Thanks again!