Gripper not working on SB F4 FC

Trying to get a 5V gripper to work on a speedybee f4 v3. I have loaded a custom build of ardu with the grip_enable params and set it to CH11 on my TX. Servo page is showing PWM values change when vehicle is connnected but no response on the servo. I have tried multiple servos and put this one on a servo tester. Works fine.



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Found a solution to this issue here: Servo Output Settings - Hardware / Other Hardware - ArduPilot Discourse

Perhaps an issue with the ardupilot firmware on this FC?