Users are unable to access Microsoft 365 services in South America
ID: MO1309330
Issue type: Incident
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Impacted services
Microsoft 365 suite
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Details
Title: Users are unable to access Microsoft 365 services in South America
User impact: Some users were unable to access Microsoft 365 services.
More info: Users may have experienced email delivery delays. intermittent connection disruptions, and encountered service unavailability (503) errors when connecting to Outlook and Microsoft Teams. Additionally, users may have been unable to access SharePoint sites and OneDrive content.
Final status: Service availability has returned to pre-incident thresholds and users are no longer impacted by this issue.
Scope of impact: Some users in South America attempting to access Microsoft 365 services may have been impacted.
Start time: Wednesday, May 13, 2026, at 1:30 PM UTC
End time: Wednesday, May 13, 2026, at 4:30 PM UTC
Preliminary root cause: Network connectivity issues resulting from a damaged fiber cable caused certain network paths to become unstable. This was further exacerbated by an influx in traffic being routed through alternate paths.
Next steps:
We're examining our failover mechanisms so we can identify areas for more effective traffic rerouting duration during future connectivity issues.
A preliminary post incident report (PIR) Will be published within 2 business days from closure, and a final PIR will be published within 5 business days from closure.
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