Outage in Microsoft 365
Some users in the United States and United Kingdom may be unable to access Microsoft 365 services
Resolved Minor
September 16, 2026 - Started about 11 hours ago
- Lasted about 5 hours
Incident Report
Summary AI Generated
Users in the United States and United Kingdom experienced approximately 5 hours of intermittent access failures to Microsoft 365 services beginning September 16, 2026 at 1:22 PM UTC, with affected users encountering 502 and 503 errors along with Single Sign-On (SSO) failures. Investigation found no issues with core Microsoft 365 components, with the likely cause attributed to conditions outside the core service path, such as upstream dependencies or request routing. Impact reports subsided naturally and service telemetry confirmed stable recovery without a specific remediation action applied.
Title: Some users in the United States may be unable to access Microsoft 365 services
User impact: Users in the United States may be unable to access Microsoft 365 services.
Current status: We're reviewing service monitoring telemetry and associated reports to isolate the root cause, in order to develop a remediation plan.
Scope of impact: Impact is specific to users in the United States attempting to access Microsoft 365 services. This information may be updated as our investigation continues.
Next update by: Wednesday, September 16, 2026, at 3:30 PM UTC
User impact: Users in the United States may be unable to access Microsoft 365 services.
Current status: We're reviewing service monitoring telemetry and associated reports to isolate the root cause, in order to develop a remediation plan.
Scope of impact: Impact is specific to users in the United States attempting to access Microsoft 365 services. This information may be updated as our investigation continues.
Next update by: Wednesday, September 16, 2026, at 3:30 PM UTC
Components affected
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Latest Updates ( sorted recent to last )
about 8 hours ago - at 09/16/2026 05:00PM
Title: Some users in the United States and United Kingdom may be unable to access Microsoft 365 services
User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services.
More info: Impacted users may encounter 502 or 503 errors when attempting to access Microsoft 365 services.
Current status: Impact reports have largely subsided, and service telemetry continues to indicate stable service conditions. Our investigation hasn’t identified a corresponding issue within the Microsoft 365 service environment, and we’re assessing whether conditions outside the core service path contributed to the reported impact. We’re continuing to monitor service health and validate sustained recovery.
Start time: Wednesday, September 16, 2026, at 1:22 PM UTC
Next update by: Wednesday, September 16, 2026, at 6:30 PM UTC
about 8 hours ago - at 09/16/2026 04:16PM
Title: Some users in the United States and United Kingdom may be unable to access Microsoft 365 services
User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services.
More info: Impacted users may encounter 502 or 503 errors when attempting to access Microsoft 365 services.
Current status: Impact reports continue to decrease. Our investigation has not identified any issues with core Microsoft 365 components. As part of our ongoing root cause analysis, we're focusing on the request paths and dependency conditions associated with the reported Single Sign-On (SSO) failures and 5xx errors, while continuing to monitor and confirm sustained recovery.
Start time: Wednesday, September 16, 2026, at 1:22 PM UTC
Next update by: Wednesday, September 16, 2026, at 5:30 PM UTC
about 9 hours ago - at 09/16/2026 03:42PM
The majority of impact reports have subsided, however, we continue to investigate. Specifically, we're reviewing multiple sections of the request flows, including IP filtering, upstream dependencies and service access paths associated with the reported Single Sign-On (SSO) failures.
This quick update is designed to give the latest information on this issue.
Next update by: Wednesday, September 16, 2026, at 4:30 PM UTC
about 10 hours ago - at 09/16/2026 03:06PM
Title: Some users in the United States and United Kingdom may be unable to access Microsoft 365 services
User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services.
More info: Impacted users may encounter 502 or 503 errors when attempting to access Microsoft 365 services.
Current status: Our investigation remains focused on the cause of the Single Sign-On (SSO) failures and associated 5xx errors. In parallel, we're reviewing upstream dependencies to determine whether they are contributing to the impact. While some affected customers have reported improvement in service availability, our investigation continues as we work towards a full resolution.
Start time: Wednesday, September 16, 2026, at 1:22 PM UTC
Next update by: Wednesday, September 16, 2026, at 4:30 PM UTC
about 10 hours ago - at 09/16/2026 02:30PM
Title: Some users in the United States and United Kingdom may be unable to access Microsoft 365 services
User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services.
Current status: We're reviewing service telemetry while investigating reports of users encountering 502 and 503 errors when accessing Microsoft 365 services. Recent user reports indicate the impact may be decreasing and we're continuing to analyze service health data to determine whether service conditions are improving and to isolate the source of impact.
Scope of impact: Impact is specific to users attempting to access Microsoft 365 services and users whose service requests are routed through the United States and United Kingdom regions. This information may be updated as our investigation continues.
Next update by: Wednesday, September 16, 2026, at 3:30 PM UTC
about 11 hours ago - at 09/16/2026 02:06PM
We're reviewing service telemetry and investigating user reports of 502 and 503 errors when attempting to access Microsoft 365 services to further isolate the source of impact and determine our next remediation steps.
This quick update is designed to give the latest information on this issue.
Next update by: Wednesday, September 16, 2026, at 3:30 PM UTC
about 11 hours ago - at 09/16/2026 01:49PM
Title: Some users in the United States may be unable to access Microsoft 365 services
User impact: Users in the United States may be unable to access Microsoft 365 services.
Current status: We're reviewing service monitoring telemetry and associated reports to isolate the root cause, in order to develop a remediation plan.
Scope of impact: Impact is specific to users in the United States attempting to access Microsoft 365 services. This information may be updated as our investigation continues.
Next update by: Wednesday, September 16, 2026, at 3:30 PM UTC
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