Additional features, settings, or issues not covered by specific Microsoft Teams Free categories
Open the Camera app in Windows, is the webcam also not working in that app?
If so, try each option:
1
Look at the function keys (F1 - F12) on your keyboard, if one of them has a camera icon, press that key or Fn + that key to unlock the webcam.
2
If that was not the problem, look at the camera lens above your screen, is there a small privacy slider that needs to be opened to access the webcam?
3
If the webcam is still not working, go to the support page for your laptop on the manufacturers website, then from there, download and re-install the version of webcam drivers they provide