Any web application (Zoom, Photobooth, etc) not only fails with the external Logitech webcam connected, but the built-in FaceTime camera does not work with the webcam connected. The image flickers and then stops working completely until I disconnect the Logitech camera.
The external camera works fine with non macOS devices.
When connecting the device, I can see it detected as a USB device.
Tried different USB ports, and external hubs with same results.
What can I try next?