M365 Archive

RM542189 - Microsoft Defender for Office 365: Admins can block external users in Microsoft Teams from Defender Portal

Microsoft 365 Roadmap

Roadmap ID

542189

View in M365 Roadmap

Status

Launched

Release

General Availability

Last Updated

Feb 24, 2026

Published Dec 12, 2025

Platforms

Web

Service

Microsoft Defender for Office 365
Microsoft Teams

Tag

Launched
General Availability
Worldwide (Standard Multi-Tenant)

Cloud

Worldwide (Standard Multi-Tenant)

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.

Description

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.

GA date: February CY2026