Posted inMicrosoft Teams

MC1528011: Microsoft Teams Adds External Presenter Support to Event Group Chat

4 minutesPosted inMicrosoft Teams
MWPRO IMPACT SCORE
OPERATIONAL IMPACT
51
0 25 50 75 100
HIGH IMPACT • REVIEW RECOMMENDED
Recommended Action:
Review the update and plan any required actions before rollout.
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Primary Audience

Teams AdminsMicrosoft 365 AdminsIT ManagersService OwnersSecurity TeamsCompliance Teams
Why this score?
AI Confidence
HIGH
Enough detail is available to trust this assessment.
Assessment Reasoning
The timeline has been moved by one month, reducing short-term urgency but still requiring tenant configuration if external collaboration is desired. Admins will need to check external access and green room settings before rollout. Presenters and event organisers gain new chat functionality, but the user workflow change is moderate and largely admin-controlled.
60
🛡️ Admin Impact
HIGH
40
👥 User Impact
MEDIUM
45
⚡ Urgency
MEDIUM
50
🔧 Effort
HIGH
ℹ️ WHAT YOU NEED TO KNOW
📌

AT A GLANCE

Teams events will soon support external presenters in event group chat. This lets outside presenters take part in coordination chats during meetings with Green room enabled.
👥

END USERS

External presenters can join and post in event group chat when allowed.
🛡️

IT ADMINS

Check Teams admin settings to ensure external user collaboration is enabled if you plan to use this feature.
📅

ROLLOUT TIMELINE

Upcoming:
December 2026

📢 Official Microsoft Message Center Announcement

(Updated) Microsoft Teams: External presenter support for event group chat
Message ID: MC1528011 (Updated)

Updated October 29, 2026: We have updated the timeline. Thank you for your patience. 

[What and why]

We are adding support for external presenters in event group chat, the private chat used by organizers, co-organizers, and presenters for coordination during an event or structured meeting. This change enables presenters who are outside the tenant hosting the meeting or event to participate in the event group chat.

[Rollout schedule]

  • General Availability (Worldwide): Rollout will begin in early December 2026 (previously early November) and is expected to complete by early January 2027 (previously early December 2026).

[Impact on your organization]

Who is affected

  • Organizers, co-organizers, and presenters using event group chat in meetings or events, including external presenters.

Platforms and services

  • Microsoft Teams
  • Event group chat
  • Meetings and events with the Enable Green room Teams meeting option enabled

What will happen

  • External presenters will be able to join the event group chat used for coordination during a meeting or event.
  • The meeting or event must have the Enable Green room Teams meeting option enabled to use event group chat. 
  • External user collaboration must be enabled for external presenters to use this functionality.

[Action required and recommendations]

If your organization wants external presenters to use event group chat, ensure external user collaboration is enabled in Teams admin center > External collaboration.

[Compliance considerations]

Does the change store new customer data?

  • No. Expected changes on the client will only correct the tenantId to the external federated presenter’s own tenant.

Does the change alter how existing customer data is processed, stored, or accessed (e.g., documents, emails, chats, etc.)?

  • Yes. External federated presenters can now read and post in the event group chat. That includes messages written before they joined, if the thread shows history. The presenter’s stored tenantId also changes from the organizer’s tenant to the presenter’s own tenant.

Does the change provide a new way of communicating between users, tenants, or subscriptions?

  • Yes. We are adding a new cross-tenant chat path between the organizer’s tenant and external presenters. Both tenants must allow external access.

Does the change modify how users can access, export, delete, or correct their personal data within Microsoft 365 services (GDPR Data Subject Rights)?

  • No. External presenters’ messages fall under existing federated-chat handling.

Source: Microsoft Message Center • Analysed by MWPro

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