PixHawk Aux Relay Parameters setting Confusions - SOLVED

Hey guys, i have the same problem and already tried everything you suggested but cant get it to work.
I’m using a Cuav V5 Nano, do i need to setup anything different compared to a regular pixhawk?
My Arducopter version is 4.0.3 and no matter what i try, the relay output is not working so far.
My current settings:
RC7_OPTION 28
RELAY_PIN 50
My multimeter reads 4V on all three Aux ports, regardless if they are triggered or not.
Any ideas what i’m doing wrong?

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