I have recently installed Norton 360 which includes the Norton SafeCam feature. The first time I opened a chat app I would get the pop-up saying Access has been granted but none of the apps can actually use the webcam. I even tried to disable SafeCam completely but same thing.
I'm using an Asus VivoBook S15 laptop with Windows 11. I can see the Webcam LED being lit (as in use) whenever I try to use video in the chat apps, but there is no image. Just the icon from the screenshot above