Power Cycling your PC will end up causing more harm than good because your putting extra stress for every startup.

Oh, just leave your PC on overnight then. It’s a security thing to have to input the Pin. Also, just remote desktop into your PC, and enter the Pin that way if you absolutely want to turn your PC off overnight.

If it’s a power draw concern, it probably uses less than 40w of power at idle.

You cannot disable the Moonlight Authorization Pin. It should simply allow you to put it in and never ask for it a second time.