Mapped 747 Autopilot push buttons don't respond

Game is standard Win10 install, no extra stuff.

I’m trying to map the various AP push buttons for the 747 but none respond to keypresses, only to the standard mouse clicking. I’ve tried mapping to the toggle, on and off functions but none of them do anything.
I can map and control the A/S, V/S and ALT rotary knobs just fine.

Is this normal ?