Overflow Capability Now Available for Large Teams Meetings

Now deployed to Office 365 tenants, large Teams meetings can support up to 20,000 view-only attendees, if an organization chooses to update its Teams meeting policies. Interestingly, this is a feature which Microsoft originally planned to license under its Teams advanced communication add-on, but the growth of large meetings in organizations might have forced their hand to bring the feature to mainline Teams.

https://office365itpros.com/2021/03/03/overflow-capability-large-teams-meetings/