Microsoft 365 Copilot: Domain exclusion for web grounding

What and why Microsoft is introducing Domain Exclusion for Microsoft 365 Copilot, now generally available. This feature enables administrators to exclude specific domains from web grounding so that Copilot responses align with organizational policies and trusted sources. This capability gives admins greater control over how external web content is used in Copilot experiences. This message is associated with Microsoft 365 Roadmap ID 503144. Rollout schedule General Availability (Worldwide): Beginning mid-July 2026 and expected to complete late July 2026 PowerShell script available: July 16, 2026 Impact on your organization Who is affected Microsoft 365 administrators managing Copilot configuration Platforms and services Microsoft 365 Copilot Copilot Chat Web grounding scenarios What will happen Admins can define up to 1,000 domains to exclude from Copilot web grounding. Excluded domains will not be used in Copilot responses that rely on web grounding. The feature is not enabled by default and requires admin action. There is no change to the user experience unless configured by admins. Action required and recommendations No action is required for this feature to become available in your tenant. Learn more: Learn documentation and PowerShell script will be available upon GA at: https://aka.ms/copilot/DomainExclusion Compliance considerations Question Answer Does the change introduce or significantly modify AI or machine learning capabilities that interact with or provide access to customer data? Yes. Admins can configure domain exclusion to exclude up to 1,000 domains from Copilot web grounding Does the change include an admin control and, can it be controlled through Entra ID group membership? Yes. Administrators can configure domain exclusions using a PowerShell script.