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Microsoft Teams integration with Microsoft Defender for Office Tenant/Allow Block List for domains

Why it matters: Generally available

Security and IT admins can increase domain-level control with the Tenant Allow/Block List feature in the Microsoft Defender portal to block domains for Microsoft Teams. This post was published previously with incorrect information and has been corrected. We apologize for the inconvenience.

Target December CY2025Cloud WorldwidePlatform WebSource updated 2025-12-17

Affected: Microsoft Defender for Office 365, Microsoft Teams

View at Microsoft →