BLTOUCH_DEBUG commands not working

I'm trying to do initial setup (with RatOS2 Alpha) and am not able to get the BLTouch to work.

Setup: Octopus Pro 446
Toolboard: EBB42 v1.2

When the printer first boots the BLTouch goes through the self test and then enters idle state (solid red, retracted). When issuing a BLTOUCH_DEBUG COMMAND=pin_down I get:
7:10 PM
Sending BLTOUCH_DEBUG COMMAND=pin_down
7:10 PM
BLTOUCH_DEBUG COMMAND=pin_down

in console, and then no motion from the BLTouch.

I verified the wiring is correct for the toolboard, and verified that there's proper connectivity between the pins on both connectors.
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