fn + camera refers to the FUNCTION KEY on your keyboard and the CAMERA key. Most laptops with built in cameras have a key sequence like this to enable/disable the camera. Some, also, have a slider that will cover the lens if you wish to be certain the camera isn't recording. Some also have a BIOS setting to enable/disable the camera.
I have a MOUSE (yes, that's the brand name) camera on my desktop and FWIW, it too stopped working well after the latest updates. For other reasons, 7th corrupted user profile within 6 months, I have formatted and reinstalled Windows 11 23H2 for the 4th time in as many months. And still, today, reboot and the camera doesn't work until I remove the drivers and reinstall them after EVERY reboot. This was NOT the case prior to the 23H2 update.
I am thinking lately that Microsoft has forgotten how to write software. And, in retrospect since the early 90's I am wondering if they ever knew HOW!
I write software for a medical company. If my Team screws up, people DIE. We could NEVER get away with the sort of **** Microsoft is pushing! For this reason and others, we prefer our clients use LINUX (pick your flavor), not Windows!