Microsoft 365 Outage Disrupts Core Services Following Configuration Error
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A multi-day failure involving authentication components impacted Outlook, Teams, and Copilot, forcing Microsoft into a period of extended monitoring.
Microsoft is currently working to resolve a multi-day service outage that disrupted access to Outlook email and several other Microsoft 365 services, as TechCrunch first reported.
The disruption began with an issue affecting the Exchange Online service, which resulted in authentication failures and email delays for Outlook users. According to TechCrunch, Microsoft's status page indicated the broader failure was caused by a "core authentication configuration" error that impacted multiple services. In addition to Outlook, affected platforms included Copilot, Teams, SharePoint, the Microsoft 365 Admin Center, Purview, Defender XDR, and Universal Print.
Microsoft disclosed via X that an investigation revealed a misconfiguration that prevented authentication components from deploying as expected across a portion of its infrastructure. To address the failure, the company reviewed recent changes and implemented various mitigations.
By 10 p.m. ET on Monday, Microsoft noted that search functionality was still degraded even as mail flow showed signs of improvement. TechCrunch reports that by 3 a.m. ET on Tuesday, the company observed improvements in search functionality.
As of Tuesday, Microsoft has not declared that services have returned to normal. In a recent update on X, the company stated that "mitigation actions are continuing to progress" and that telemetry data remains positive. Microsoft indicated it is now entering a period of extended monitoring to ensure the issue is fully resolved.