check before: 2026-04-01
Product:
Copilot, Microsoft 365 Copilot
Platform:
Online, US Instances, Web, World tenant
Status:
Change type:
Admin impact, Updated message
Links:
Details:
Summary:
Microsoft 365 Copilot APIs will transition from office.com to cloud.microsoft domain by mid-May 2026, improving reliability and security without user impact. Administrators must ensure network configurations allow traffic and WebSocket connections to *.cloud.microsoft to avoid service issues. No compliance changes identified.
Details:
Updated April 30, 2026: We have updated the timeline. Thank you for your patience.
[Introduction]
We're updating the API endpoints used by Microsoft 365 Copilot to align with Microsoft's ongoing transition to the cloud.microsoft domain. This change improves service reliability and security by ensuring Copilot-connected workloads use modernized Microsoft 365 network endpoints.
This update is part of a previously announced Microsoft domain unification initiative across Microsoft 365 services. This update does not introduce changes to the Microsoft 365 Copilot user interface and will not impact user experience, provided your environment follows published Microsoft 365 and Copilot network configuration requirements.
[When this will happen:]
General Availability (Worldwide, GCC): Rollout will begin in late April 2026 and is expected to complete by mid-May 2026 (previously late April).
Change Category:
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Scope:
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Release Phase:
Created:
2026-04-21
updated:
2026-05-01
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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summary for non-techies**
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Direct effects for Operations**
Network Configuration Issues
If network configurations do not allow traffic to *.cloud.microsoft, users may experience performance or reliability issues with Microsoft 365 Copilot.
- roles: Microsoft 365 Administrators, Network Engineers
- references: https://learn.microsoft.com/microsoft-365/copilot/microsoft-365-copilot-requirements#network-requirements, https://techcommunity.microsoft.com/blog/microsoft_365blog/introducing-cloud-microsoft-a-unified-domain-for-microsoft-365-apps-and-services/3804961
WebSocket Connectivity Problems
Blocking or interfering with WebSocket connections to *.cloud.microsoft may lead to degraded service performance for Microsoft 365 Copilot.
- roles: Microsoft 365 Administrators, Network Engineers
- references: https://learn.microsoft.com/microsoft-365/copilot/microsoft-365-copilot-requirements#network-requirements, https://connectivity.m365.cloud.microsoft/copilot
User Experience Degradation
Users may face issues with Microsoft 365 Copilot if the organization has restrictive firewall or proxy settings that are not updated.
- roles: End Users, Helpdesk Support
- references: https://learn.microsoft.com/microsoft-365/enterprise/cloud-microsoft-domain?view=o365-worldwide, https://techcommunity.microsoft.com/blog/microsoft_365blog/introducing-cloud-microsoft-a-unified-domain-for-microsoft-365-apps-and-services/3804961
Increased Support Tickets
Failure to prepare for the transition may result in an increase in support tickets related to Microsoft 365 Copilot issues.
- roles: Helpdesk Support, IT Support Staff
- references: https://learn.microsoft.com/microsoft-365/copilot/microsoft-365-copilot-requirements#network-requirements, https://connectivity.m365.cloud.microsoft/copilot
Service Outages
Organizations that do not comply with the new network requirements may experience service outages for Microsoft 365 Copilot.
- roles: Microsoft 365 Administrators, Network Engineers
- references: https://learn.microsoft.com/microsoft-365/enterprise/urls-and-ip-address-ranges?view=o365-worldwide, https://techcommunity.microsoft.com/blog/microsoft_365blog/introducing-cloud-microsoft-a-unified-domain-for-microsoft-365-apps-and-services/3804961
Configutation Options**
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Opportunities**
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Potentional Risks**
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Data Protection**
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IT Security**
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Hypothetical Work Council Statement**
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DPIA Draft**
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explanation for non-techies**
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change history
| Date | Property | old | new |
| 2026-05-01 | MC MessageTagNames | Admin impact | Updated message, Admin impact |
| 2026-05-01 | MC Summary | Microsoft 365 Copilot APIs will transition from office.com to cloud.microsoft domain by late April 2026, improving reliability and security without UI changes. Admins must ensure network configurations allow *.cloud.microsoft traffic and WebSocket connections to avoid service issues. No compliance impacts expected. | Microsoft 365 Copilot APIs will transition from office.com to cloud.microsoft domain by mid-May 2026, improving reliability and security without user impact. Administrators must ensure network configurations allow traffic and WebSocket connections to *.cloud.microsoft to avoid service issues. No compliance changes identified. |
| 2026-05-01 | MC Last Updated | 04/20/2026 23:32:10 | 2026-04-30T22:56:58Z |
| 2026-05-01 | MC Messages | [Introduction]
We're updating the API endpoints used by Microsoft 365 Copilot to align with Microsoft's ongoing transition to the cloud.microsoft domain. This change improves service reliability and security by ensuring Copilot-connected workloads use modernized Microsoft 365 network endpoints. This update is part of a previously announced Microsoft domain unification initiative across Microsoft 365 services. This update does not introduce changes to the Microsoft 365 Copilot user interface and will not impact user experience, provided your environment follows published Microsoft 365 and Copilot network configuration requirements. [When this will happen:] General Availability (Worldwide, GCC): Rollout will begin in late April 2026 and is expected to complete by late April 2026. | Updated April 30, 2026: We have updated the timeline. Thank you for your patience.
[Introduction] We're updating the API endpoints used by Microsoft 365 Copilot to align with Microsoft's ongoing transition to the cloud.microsoft domain. This change improves service reliability and security by ensuring Copilot-connected workloads use modernized Microsoft 365 network endpoints. This update is part of a previously announced Microsoft domain unification initiative across Microsoft 365 services. This update does not introduce changes to the Microsoft 365 Copilot user interface and will not impact user experience, provided your environment follows published Microsoft 365 and Copilot network configuration requirements. [When this will happen:] General Availability (Worldwide, GCC): Rollout will begin in late April 2026 and is expected to complete by mid-May 2026 (previously late April). |
| 2026-05-01 | MC Title | Microsoft 365 Copilot transition to the cloud.microsoft domain | (Updated) Microsoft 365 Copilot transition to the cloud.microsoft domain |
| 2026-05-01 | MC End Time | 05/30/2026 09:00:00 | 2026-06-22T09:00:00Z |
Last updated 2 weeks ago ago
