Originally posted by Microsoft
May 11, 2021
Microsoft Teams
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This new external group chat feature enables your users to initiate and participate in group Teams chats with users from outside your organization, AAD identity required. Expanding on the existing ability for Teams users to find, participate in 1:1 chat, call and set up meetings with external users, external group chat in Teams supports up to 250 participants across multiple organizations in a single chat. This is rolling out on Teams desktop, web and mobile.
- External group chat is part of Microsoft Teams Connect. Azure Active Directory (AAD) is required. The organizations are required to use the open federation policy or be on each other’s allow list.

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