Some laptops have a physical button that turns the camera on and off. This is practical, but it's sometimes easy to forget that the button is turned off. None of the troubleshooting efforts will lead to Teams finding the camera unless you switch the button to “On” first. You might also have a problem with the camera, especially if you’re using an external device. Sometimes the cable or the camera lens is damaged, and Teams can’t detect it. If that’s the case, you’ll need to repair or replace the camera.