Posted inMicrosoft 365 suite

MC1456610: Microsoft 365 Copilot Chat in Edge Shifts to New Commercial Endpoint for Network Access

3 minutesPosted inMicrosoft 365 suite
MWPRO IMPACT SCORE
OPERATIONAL IMPACT
53
0 25 50 75 100
HIGH IMPACT • REVIEW RECOMMENDED
Recommended Action:
Review the update and plan any required actions before rollout.
▶ What is MWPro Impact Score? Watch our 60‑second explainer

Primary Audience

Tenant AdminsMicrosoft 365 AdminsSecurity TeamsIT ManagersService Owners
Why this score?
AI Confidence
HIGH
Enough detail is available to trust this assessment.
Assessment Reasoning
The change affects the network endpoint for Microsoft 365 Copilot Chat in Edge, which requires admins to update allowlists or blocklists before rollout in late September 2026. Failure to act could block access to Copilot Chat, creating user disruption. The effort involves reviewing and updating firewall or proxy configurations and validating access, which adds moderate admin impact but limited direct user involvement.
65
🛡️ Admin Impact
HIGH
20
👥 User Impact
LOW
60
⚡ Urgency
HIGH
50
🔧 Effort
HIGH
ℹ️ WHAT YOU NEED TO KNOW
📌

AT A GLANCE

Microsoft 365 Copilot Chat in Edge will switch to a new network endpoint. Check allowlists to keep access working after rollout.
👥

END USERS

Users may lose access to Copilot Chat in Edge if the new endpoint is blocked.
🛡️

IT ADMINS

Update network allowlists or blocklists to include the new Copilot Chat endpoint before rollout.
📅

ROLLOUT TIMELINE

Upcoming:
Late September 2026

📢 Official Microsoft Message Center Announcement

Microsoft 365 Copilot Chat: Updated commercial Copilot endpoint for Microsoft Edge
Message ID: MC1456610

[What and why]

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

[Compliance considerations]

No compliance considerations identified. Review as appropriate for your organization.

Source: Microsoft Message Center • Analysed by MWPro

Share This Update
Tags: