![(Updated) Microsoft Defender for Office 365: Admins can block external users in Microsoft Teams from Defender Portal [MC1200058]](https://mwpro.co.uk/wp-content/uploads/2025/06/pexels-francesco-ungaro-669319-1024x683.webp "(Updated) Microsoft Defender for Office 365: Admins can block external users in Microsoft Teams from Defender Portal [MC1200058] 1")
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(Updated) Microsoft Defender for Office 365: Admins can block external users in Microsoft Teams from Defender Portal [MC1200058]
Message ID: MC1200058 (Updated) Updated January 23, 2026: We have updated the timeline. Thank you for your patience. [Introduction] We’re introducing an integration between Microsoft Teams and Microsoft Defender for Office 365 that allows security admins to manage blocked external users…
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