Will number 301 be blocked?
No, it will not block the participant to join the meeting. Attendees who join the meeting first, up to the capacity of the main meeting, will get the full Teams meeting experience. They can share audio and video, see shared videos, and participate in meeting chat. Attendees who join after the main meeting capacity has been reached will have a view-only experience. For more details about it, you can refer to:
https://learn.microsoft.com/en-us/microsoftteams/view-only-meeting-experience
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