Camera not working on Zoom only, all troubleshooting steps have failed

I'm IT for a small nonprofit and I'm trying to support an employee whose camera isn't working on Zoom. It works fine on the built-in camera app. In Zoom, it shows a black screen. The frustrating thing is, I've tried every troubleshooting step I've seen listed. The computer is a Gateway GWTN156-7.

Steps I've tried:

• Updating the camera driver in device manager (no update)
• Uninstalling the camera in device manager and restarting
• Ensuring that desktop apps have permission to use the camera
• Uninstalling the USB hub in device manager and restarting
• Removing the camera from the Windows "Bluetooth and devices" menu and restarting
• Updating Windows and restarting (all updates now current)
• Checking that the camera switch isn't turned off (it's not, again, other apps work)
• Looking for a driver for the camera on the Gateway support site (no camera drivers listed)
• Disabling hardware acceleration in Zoom
• Running the Windows video troubleshooter
• Changing capture methods to either direct capture and media foundation and restarting Zoom
• Repairing the Zoom installation
• Uninstalling and re-installing Zoom and restarting

I'm at my wit's end here. I've tried everything I can think of. Does anyone have any troubleshooting steps I've omitted?