HOT SHOE ISSUE Pixhawk 4, copter 4.0.7

I have an issue with my hot shoe system I didn’t see the feedback.

anyone knows maybe What is the problem? maybe I missed some parameters?

my parameters:
cam_feedback_pin-53 (and the cable in aux 4)
cam_feedback_pol- 1

pixhwak 4 holybro
GPS f9p holybro