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Microsoft 365 services • Service Alert

Some users in the United States may be unable to access Microsoft 365 services

Created Sep 16, 2026, 10:29 AM • Last updated Sep 16, 2026, 2:23 PM
Medium Resolved

Incident Details

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.

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Scope: User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services.

Incident Timeline

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Update
Microsoft 365 Issues have been resolved, and all products are operational.
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Alert Created
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.