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Roadmap ID 542189 Launched

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

Microsoft 365 roadmap entry

Summary

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.

Status
Launched
General availability target
Feb 2026
Preview target
Not published
Products
Microsoft Defender for Office 365, Microsoft Teams
Clouds
Worldwide (Standard Multi-Tenant)
Release phases
General Availability
Platforms
Web
Added to the roadmap
12 Dec 2025
Last changed
24 Feb 2026 · 7mo ago
recently changed
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