*For this entry exists the more relevant or more recent entry MC1200058
check before: 2026-02-01
Product:
Defender, Defender for Office 365, Teams
Platform:
Web, World tenant
Status:
Rolling out
Change type:
Links:
Details:
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 Category:
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Scope:
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Release Phase:
General Availability
Created:
2025-12-18
updated:
2026-02-18
Docu to Check
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MS workload name
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summary for non-techies**
Microsoft has introduced a feature in Microsoft Defender for Office 365 Plan 1 and above that allows security administrators to block external users from sending messages, making calls, or sending meeting invitations over Microsoft Teams through the Tenant Allow Block List.
Direct effects for Operations**
Please, look at the most relevant linked item for details
explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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change history
| Date | Property | old | new |
| 2026-02-18 | RM Status | In development | Rolling out |
| 2026-01-29 | RM Release | January CY2026 | February CY2026 |
| 2026-01-29 | RM Status | Rolling out | In development |
| 2026-01-29 | RM 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 | 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. |
| 2026-01-07 | RM Status | In development | Rolling out |
Last updated 1 day ago ago
