GoKawiilMicrosoft says a bug in its automated network maintenance request system caused Thursday's massive outage by mistakenly removing IP routes from more devices than intended, disrupting Azure and Microsoft 365 services.
The outage began at 10:44 AM ET on Thursday, July 23, and mostly affected customers accessing Microsoft 365 services through network infrastructure connected to Microsoft’s West US Azure region.
At 11:11 AM ET, Downdetector had recorded 2,403 outage reports, sharply above its normal baseline of 29. SharePoint accounted for 78% of the complaints, followed by Excel at 11% and the Microsoft 365 Admin Center at 6%.
Microsoft tracked the Microsoft 365 outage under incident ID MO1437424 and confirmed that multiple Microsoft 365 services were impacted:
Microsoft OneDrive - Access to OneDrive was intermittent.
- Access to OneDrive was intermittent. SharePoint Online - Users received "Something went wrong" errors.
- Users received "Something went wrong" errors. Microsoft Teams - Chat functionality was degraded, including images not loading.
- Chat functionality was degraded, including images not loading. Microsoft 365 Admin Center - The Admin Center loaded slowly or not at all.
- The Admin Center loaded slowly or not at all. Power Automate - Automate flows did not load.
- Automate flows did not load. Copilot Chat - Users experienced intermittent delays or failures when performing actions and queries.
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