Microsoft Teams: External group chat policy enforcements for max two orgs

🚨 The Signal: Microsoft Teams now enforces external group chat policies, limiting participation to members from a maximum of two organisations. This enhances control over cross-tenant collaboration and reduces data sprawl risks.

The Impact

Tenant admins and users are affected by new external chat restrictions, reducing the risk of uncontrolled data sharing.

• Tenant Admins: Gain granular control over external chat policies, reducing data leakage risk.
• End Users: May experience limitations in multi-organisation group chats, improving data boundary clarity.
• Security Teams: Benefit from reduced attack surface for external collaboration, enhancing incident response.
• Compliance Officers: Improved ability to meet data residency and sharing compliance requirements.

The Action

1. Review existing external access policies in Teams Admin Center.
2. Define new bilateral chat policies for users and groups via Teams Admin Center > Users > External access.
3. Communicate new external chat limitations to end-users.
4. Monitor audit logs for policy enforcement and user feedback.

Domain: Teams · Impact: medium · Workload: Teams