Microsoft Teams: Control External Access by Domain for Specific Users and Groups

Gain granular control over external communication. By setting custom External Access policies, you can define domain allow/deny lists and assign them to specific users or groups – capabilities that were previously tenant-wide only (“Teams and Skype for Business users in external organizations”). Use this to pilot with a department, restrict high‑risk roles to approved partners, or open federation broadly where appropriate. Example: Allow Group A to communicate only with a specific domain, while Group B can communicate with all external domains. Product Microsoft Teams Release phase Targeted Release Release date September CY2025 Platform Web Cloud Instance Worldwide (Standard Multi-Tenant) Created 2025-08-26 Roadmap ID 501275 Roadmap Link https://www.microsoft.com/microsoft-365/roadmap?id=501275

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