Summary
- Microsoft 365 Copilot Chat in Microsoft Edge is changing the compliant sidebar endpoint used for commercial Copilot access.
- The endpoint is moving from `outlook.office.com/hosted/semanticoverview/Users` to `cr.m365copilotapp.svc.cloud.microsoft`.
- Organizations that manage network allowlists or blocklists may need to update firewall/proxy rules to preserve access.
- This affects Microsoft Edge users accessing Copilot Chat in the sidebar; tenants not filtering this service are not expected to be impacted.
Microsoft 365 Copilot Chat in Microsoft Edge will change its endpoint to cr.m365copilotapp.svc.cloud.microsoft by late September 2026. Organizations managing network allowlists or blocklists must update configurations to maintain access. No changes affect those not managing endpoint restrictions. Review and update settings accordingly.
Microsoft 365 Message Center ID: MC1456610
Primary Service: Edge
Admin Impact: Medium
User Impact: Medium
Release Start: 30 Sept 2026
Release End: 30 Sept 2026
Published: Aug 17, 2026
Last Modified: September 10, 2026
Action by: 24 Sept 2026
Category: Plan for change
Tags: New feature, User impact, Admin impact, User Adoption
Status: Launched
Products & Platforms: Microsoft 365 suite, Microsoft Copilot (Microsoft 365), Edge
History
Updated September 9, 2026: We are removing this post as the feature described below is now being tracked in MC1462915. You can safely disregard this message.
8/17/2026 Item Added to Message Center
Microsoft Message
Microsoft 365 Copilot Chat in Microsoft Edge is updating the endpoint used for the compliant Copilot Chat experience in the Edge sidebar. The endpoint is changing from outlook.office.com/hosted/semanticoverview/Users to cr.m365copilotapp.svc.cloud.microsoft.
This change aligns Microsoft 365 Copilot Chat in Edge with the current endpoint architecture and documented Microsoft Edge allowlist requirements. Organizations that manage network allowlists or blocklists may need to update their configurations to ensure continued access to Microsoft 365 Copilot Chat in Edge.
Rollout schedule
General Availability (Worldwide, GCC, GCC High, DoD): Beginning in late September 2026 and expected to complete by late September 2026
Impact on your organization
Who is affected
- Organizations that use network allowlists or blocklists to manage access to Microsoft 365 Copilot Chat in Microsoft Edge
- Microsoft 365 Copilot Chat users accessing Copilot Chat through the Microsoft Edge sidebar
Platforms and services
- Microsoft Edge
- Microsoft 365 Copilot Chat
What will happen
- Microsoft 365 Copilot Chat in Edge will begin using the commercial Copilot endpoint cr.m365copilotapp.svc.cloud.microsoft instead of outlook.office.com/hosted/semanticoverview/Users.
- Organizations that explicitly allow or block network endpoints for Microsoft 365 Copilot Chat in Edge may need to update their configurations.
- If the new endpoint is blocked or not allowlisted, users may experience issues accessing Microsoft 365 Copilot Chat in Edge.
- No changes are expected for organizations that do not manage endpoint allowlists or blocklists for this service.
Action required and recommendations
Action required: Review and, if necessary, update your organization’s network allowlists and blocklists before rollout begins.
Recommended actions:
- Review any network configurations that control access to Microsoft 365 Copilot Chat in Microsoft Edge.
- Add the following endpoint where required: cr.m365copilotapp.svc.cloud.microsoft
- Validate that users can continue to access Microsoft 365 Copilot Chat in Edge after the rollout.
Learn more
Microsoft 365 Copilot Chat – Allow list for Microsoft Edge endpoints | Microsoft Edge | Microsoft Learn
Compliance considerations
No compliance considerations identified. Review as appropriate for your organization.