Managing sound and video settings during Teams meetings and calls for optimal communication
The "Test mic and speaker" feature is not reliable and might be confusing.
As a rule, the microphone test is working, and if you can hear the playback for the microphone test, then this means that both microphone and speaker work. Nothing to worry about.
It is a big mystery why the "Make a test call" feature is not included in Teams Personal. Personally, I'm using the old good Skype "Echo / Sound Test Service ." bot to test both audio and video performance. Unfortunately, Microsoft is about to remove this bot from Teams Personal accounts, but insofar, it is available at least for me.