Users may be seeing degraded service functionality or be unable to access multiple Microsoft 365 services
ID: MO1221364
Issue type: Incident
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Impacted services
Microsoft 365 suite
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Details
Title: Users may be seeing degraded service functionality or be unable to access multiple Microsoft 365 services
User impact: Users may have seen degraded service functionality or were unable to access multiple Microsoft 365 services.
More info: Some of the impacted service functions included, but were not limited to:
- Sending and receiving email through Exchange Online, including notification email from Microsoft Viva Engage as well as subscription email for Microsoft Fabric users. Users may be receiving a "451 4.3.2 temporary server issue" error message when attempting to send or receive email through Outlook.
- Collecting message traces in Exchange Online.
- Searching within SharePoint Online, Microsoft OneDrive, and/or Microsoft Teams.
- Accessing the service portals, including Microsoft Purview, Microsoft Defender XDR, and the Microsoft 365 admin center.
- Creating chats, meetings, teams, channels or adding members in Microsoft Teams. Additionally, some users may have been unable to create breakout rooms or Microsoft Teams live events.
- Receiving presence or location information in Microsoft Teams.
- Existing or new meeting options for Facilitator in Teams may not have been honored.
- Applying and managing sensitivity labels, interactive operations on reports, and artifacts with sensitivity labels in Microsoft Fabric.
- Print registration and printer jobs may have failed in Universal Print.
- Microsoft To Do users may have experienced synchronization issues, preventing tasks from updating across devices. Additionally, tasks created in Shared Lists may not have appeared for collaborators.
- Microsoft Defender for Cloud Apps users may not have been able to view insights or view, create, or update OAuth enabled app policies. Reporting data may have also appeared blank, even though no errors were shown.
- Microsoft Defender for Office (MDO) users may have experienced limited access to administrative and SOC experiences, including the quarantine portal and Safe Links protection.
- Microsoft Power Automate users may have been unable to utilize Power Automate connectors including Office 365, Office 365 Users, Office 365 Groups, and Office 365 Groups Mail.
Final status: We’ve confirmed that the affected infrastructure has returned to a healthy state and is operating as expected. We’ll continue to closely monitor the remediation actions taken and make any necessary adjustments to maintain stability. If users experience any residual issues, clearing local DNS caches or temporarily lowering DNS TTL values may help ensure updates are reflected more quickly.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may have been intermittently impacted. This could have affected users located in Asia-Pacific, Europe, or Latin America.
Preliminary root cause: We identified that the issue was caused by elevated service load resulting from reduced capacity during maintenance for a subset of North America hosted infrastructure.
Start Time: Thursday, January 22, 2026, at 6:55 PM UTC
End Time: Friday, January 23, 2026, at 4:45 AM UTC
Next steps:
- We’re actively reviewing service load activity and thresholds to ensure consistent accessibility while improving overall service stability.
- We're reviewing our incident response handling to identify areas for improvement that will help reduce our time to resolution for future events.
- If the Microsoft 365 Admin center or Service health page are unavailable due to an incident, we’ll provide updates about that incident through (https://status.cloud.microsoft/). Please visit (aka.ms/incidentreadiness) for more information.
We'll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.
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