Additional features, settings, or issues not covered by specific Microsoft Teams Free categories
You should not need to upgrade to test your audio and webcam, they should work correctly.
If you open the Camera app, is your webcam working in that app, and if you go into the Settings app, Audio section, you can test your Microphone is working in there.
If both are working then your webcam and Microphone should work correctly in Teams, provided you have enabled both in Privacy & Security settings for all apps, including the Teams app, and you can also perform a test to ensure they are working in Teams on this link: