Connecting external power to the vision jet

I’m trying to start cold and dark with the default vision jet in 2024. The first issue I have is connecting external power. I’ve assigned a button on my Thrustmaster joystick to toggle external power, but when I press the button nothing happens. I’ve tried set external; power. I’ve tried toggle apu. I’ve tried set APU. I’ve tried with batteries on and with them off. I’ve tried in 2D and in VR. WTF?