Restart your computer. Plug your webcam into another available USB port. Check your webcam cable. The cable might be damaged. Test your webcam on another working computer. The above steps will let you ...

Nintendo allows third-party USB-C webcams to work with the Switch 2. "You may be able to use a USB-C camera accessory you already own. However, not all cameras may work as intended," it says in ...

Since the issue pertains to the Camera app, the first thing you should do to remediate this is to run the Camera troubleshooting utility. You will find the option for this in the Windows Settings.