7i76E+7i78 Pin connections

I have a 7i76E with P1 connecting to a 7i78 working with 6 axes and I'm trying to re-use the 7i78 spindle enable as a sinking output for a servo enable, but it's not clear how to configure this.

The 7i78 manual says the spindle enable is pin 6 on the DB25
the 7i78 manual says Pin 6 on P1 is IO22

that said, setting my enable to connect to hm2_7i76e.0.gpio.022.out doesn't seem to change the status of the pin.

(I have TB2 pin 21 ENA- connected to GND, and TB2 pin 22 ENA+ connected to the drive enable which has an internal pull-up to 5V. Measuring the voltage across this as I toggle drive enable stays at 5V)

Thanks!

if you are using the 7I76E+7I78 firmware, the 7I78 analog enable
is driven by PWM enable (on P1 26 pin header pin11 = DB25 pin 6
= GPIO26)

You would need to access this via the hal PWM enable pin
if PWM is enabled