A Microsoft communications service that provides communications capabilities across presence, instant messaging, audio/video calling, and an online meeting experience that includes audio, video, and web conferencing.
Yes, presenter and producer of live event must sign in with account.
For the attendees, they can join live event without sign-in information if the live event is public.
For more details, please refer to this article: https://learn.microsoft.com/en-us/MicrosoftTeams/teams-live-events/plan-for-teams-live-events#who-can-attend-create-and-schedule-live-events.
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