Controlling data sharing, visibility, and access permissions in Teams Free
Most laptops have a key to toggle the camera and microphone. This key is usually located between F1 and F12 and should be pressed along with the FN key.
To test the microphone, follow these steps:
Select Start > Settings > System > Sound.
Under Input, select the microphone you want to test and click "Start Test."
For the camera;
Click the Start menu and type Camera.
Open the Camera app.