A re-emphasis of the excellent advice offered by Mr. Maher.
The keyboard shortcut that can be created by request of NVDA at install that allows it to be fired up is a Windows keyboard shortcut. That CTRL+ALT+N keyboard shortcut is attached to the desktop shortcut for NVDA itself. The tweak you're making is actually completely outside NVDA itself, to the Windows keyboard shortcut assigned to the desktop shortcut for NVDA.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
The depths of denial one can be pushed to by outside forces of disapproval can make you not even recognize yourself to yourself.
~ Brian Vogel