Could you please tell me:
Did you enable the lobby when creating the meeting?
According to my test, when you enable the lobby, participants will first enter the lobby when entering the meeting. At this time, Teams will notify you that the participants are waiting for you to join the meeting. You (and anyone else allowed to admit people) will see a list of people in the lobby. From there you can choose to admit or deny them.
If you want to skip this step (start the meeting directly), you can configure the "Who can bypass the lobby?" option in the meeting.
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