In my lab with Teams, we can only perform audio devices test via “Make a test call”, you may try that to check your audio devices (click your account tile on the top right of the corner, select Settings -> Devices ):
To test camera, there isn't directly way to perform a test, but you can start a video call and video meeting in Teams, and confirm with recipients whether they can see your video.
If you need any assistance, welcome back and let me know.
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