Real-time voice or video communication between users on mobile devices or computers
Please, be aware that the "Make a test call" option is not available for users with a personal account (aka. Teams Free). This feature requires a business account.
However, the "Test mic and speaker" option is not working as expected. No sound is produced for the selected speaker device even when the speaker is known to work perfectly well with Teams.
Nevertheless, if you press the "Yes, I can hear it" button, a window with Microphone test will open.
Proceed with the microphone test, i.e. say something and then pause. If you hear your voice played back after the beep, then both your microphone and speaker are working.