Confirm my 4028 fan user override is correct in printer.cfg

In the process if trying to troubleshoot why my fan always seems to default to %39 after the second layer can I confirm my printer.cfg is correct. Currently I have ...

"[fan]
pin: !fan_part_cooling_pin
cycle_time: 0.01"

If I attempt to add the additional line "enable_pin: J50" which is my PWM signal wire pin or "enable_pin:J56" which is my power pin I get the attached error suggesting its not a valid PIN, however it is according to the Octopus 1.1 pinout .pdf


Does "enable_pin" even need to be defined?
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