Reversed Throttle, Not Arming

Hello. Apologies for a simple stupid question. I was able to arm my Pixhawk 4 by pushing my throttle and yaw joystick to the extreme position (top right). But I wanted to flip the throttle axis (so it wouldn’t take off immediately upon arming) so I reversed it in the respective RC channel for throttle, but now it is not arming. Please let me know if I can send anything that might help you understand.