Microsoft 365 Roadmap

Microsoft Defender for Office 365
Admins can block external users in Microsoft Teams from Defender Portal

Feature details and release plans from a build snapshot of Microsoft's official roadmap feed.

All Microsoft 365 updates
Product
Microsoft Defender for Office 365
Release status
Launched
RSS publication

Feature overview

Security admins with Defender for Office 365 Plan 1 and above can block external users from sending messages, calls, meetings invitation over Microsoft Teams via the Tenant Allow Block List in Microsoft Defender portal. Updated January 28, 2026: We are pausing rollout at this time as we address an ongoing issue. We apologize for any inconvenience.

Expected release date

February CY2026

Source: Microsoft 365 Roadmap RSS (build snapshot) Feature ID: 542189

RSS snapshot built . Refreshed on rebuild and deployment.

View on Microsoft