Microsoft Defender for Office 365: Admins can block external users in Microsoft Teams from Defender Portal Beta
Data as of 2 hours ago (26 October 2026)
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.
Change history
Added to the roadmap 12 December 2025. Tracked here since 1 September 2026. Earliest target we recorded: February 2026 (since tracked — Microsoft may have moved it before we started watching).
Nothing has changed on this item since tracking began on 1 September 2026. Changes appear here as Microsoft updates the feed.