Never thought to ask here...

[canetoad]

5. Have you looked at

The 'old' device manager - it's mostly redundant now with Win 11 but is still there on your computer.

Open the Settings window and type into the Find a Setting box: Device Manager

A new window will open with the computer's device settings. The list may look a bit cryptic but work your way down to 'Imaging Devices'. This is where you should see the camera listed. If there is a strange mark (yellow I think) it means there is something wong with the device or driver.

You can enable/disable devices from this window, update drivers etc. This is the first place I would look to get an idea of what is going on. Good luck.

On Edit: Another thought. Back in the main settings window, go into Privacy & Security. Scroll down to 'App Permissions' then to Camera. Click to open settings and check it's set to On and let apps access your camera.