Glad you got it working - the pause keyboard button is not used in most application anymore and is not so obvious it’s there - so it’s handy to bind to and use, MSFS used this as a default key here - the actual pause button on the keyboard comes from the older PC days, where you used this button to break, hold a process or BIOS that the computer was executing.
And like with your keyboard; it’s a function key, that’s not available on all keyboards.