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Hi @jane Jiang ,

I would like to share the latest update regarding the Microsoft 365 service disruption (Issue ID: MO1550821).

According to Microsoft's latest notification, the incident is now marked as Service Restored. Microsoft has addressed the underlying issue and continues to restore services for the remaining affected customers and regions.

Microsoft has identified the preliminary root cause as an issue during an earlier network capacity upgrade, which surfaced following a recent network change. Due to the scale of demand, services were restored gradually, with stability validated at each stage to ensure a reliable recovery.

Microsoft has also confirmed that this was a technical issue and was not related to cybersecurity threats or AI/agents.

A Post-Incident Report will be provided to share further details:

• Preliminary Post-Incident Report: Within two business days.
• Final Post-Incident Report: Within five business days.

Although the incident status is marked as Service Restored, some customers or regions may still experience ongoing service restoration.

Thank you for your patience and understanding so far.

Kind regards.

Hi @jane Jiang ,

I would like to share an update regarding the connectivity issue affecting multiple Microsoft 365 services.

According to Microsoft's notification (Incident ID: MO1550821), users may be unable to connect to or access multiple Microsoft 365 services, including Exchange Online, Microsoft Teams, SharePoint Online, Microsoft Copilot, and Microsoft Defender XDR.

Microsoft has identified that the affected infrastructure is experiencing elevated load across multiple regions, which is likely contributing to the connectivity errors. Microsoft is currently restarting and repairing impacted portions of the infrastructure to restore capacity.

The incident is currently classified as Service Degradation. Based on the latest update, Microsoft is actively working to improve infrastructure stability and restore service availability. Although partial recovery has been observed in some regions, the issue has not yet been fully resolved, and Microsoft is continuing to investigate additional mitigation measures.

If you have Microsoft 365 administrator privileges, please sign in to the Microsoft 365 Admin Center using this link to view the details of this issue.

If you're not an admin and don't know who the admin is in your organization, you can find guidance here: How can I find my Microsoft 365 admin? - Microsoft Support    

Alternatively, follow these steps:

• Sign in to the Microsoft 365 Admin Center.
• Go to Health > Service Health.
• Search for Issue ID: MO1550821.
• Select the issue and expand the details to review the latest updates, affected services, impact, and remediation information.

I'll continue to monitor this case and let you know if there is any update.

Kind regards.