Outage in Microsoft 365
Users are unable to access Microsoft 365 Copilot Chat or portal.office.com
Resolved Minor
June 11, 2026 - Started about 6 hours ago
- Lasted about 1 hour
Incident Report
Summary AI Generated
A faulty deployment caused Microsoft 365 users to lose access to Copilot Chat and portal.office.com for 1.2 hours starting at 8:00 PM UTC on June 11, 2026. Microsoft resolved the issue by reverting to a previous build, with 97% of affected infrastructure restored and service availability returning for users. Admins could use admin.cloud.microsoft as a workaround, and Copilot in Microsoft Teams remained functional throughout the incident.
Title: Users are unable to access Microsoft 365 Copilot Chat or portal.office.com
User impact: Users are unable to access Microsoft 365 Copilot Chat or portal.office.com.
More info: Admins may be able to access the Microsoft 365 admin center via admin.cloud.microsoft as a temporary solution. Additionally, Copilot in Microsoft Teams is not expected to be impacted and can be leveraged in the interim while we mitigate the issue.
Current status: This is a continuation of a communication posted under CW1387674. We’ve identified an issue with a recent deployment for Microsoft Copilot. We’re reverting to a previous build to remediate impact as soon as possible. We expect this to be completed in the next 30 minutes.
Scope of impact: Our investigation indicates that any user or admin may be affected by this event. This section is subject to change as the investigation continues.
Start time: Thursday, June 11, 2026, at 8:00 PM UTC
Estimated time to resolve: We expect the reversion to be complete in the next 30 minutes.
Root cause: The root cause is still being investigated. We will provide more information in our next update.
Next update by: Thursday, June 11, 2026, at 10:00 PM UTC
Components affected
Microsoft 365 suiteTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
about 5 hours ago - at 06/11/2026 09:54PM
Title: Users are unable to access Microsoft 365 Copilot Chat or portal.office.com
User impact: Users are unable to access Microsoft 365 Copilot Chat or portal.office.com.
More info: Admins may be able to access the Microsoft 365 admin center via admin.cloud.microsoft as a temporary solution. Additionally, Copilot in Microsoft Teams is not expected to be impacted and can be leveraged in the interim while we mitigate the issue.
Current status: We have successfully reverted the change for 97 percent of the affected infrastructure. We're continuing to monitor the progress of the reversion and we're also observing an uptick in service availability. Additionally, we've started to receive confirmation that service availability is returning for some users. In parallel, we're investigating the underlying cause of the problem and will provide more information when available.
Scope of impact: Our investigation indicates that any user or admin may be affected by this event. This section is subject to change as the investigation continues.
Start time: Thursday, June 11, 2026, at 8:00 PM UTC
Preliminary root cause: We've identified an issue with a recent deployment which is contributing to impact. We will continue to perform a root cause analysis to identify how this occurred and how we can prevent this from happening in the future.
Next update by: Thursday, June 11, 2026, at 11:00 PM UTC
about 6 hours ago - at 06/11/2026 09:20PM
Title: Users are unable to access Microsoft 365 Copilot Chat or portal.office.com
User impact: Users are unable to access Microsoft 365 Copilot Chat or portal.office.com.
More info: Admins may be able to access the Microsoft 365 admin center via admin.cloud.microsoft as a temporary solution. Additionally, Copilot in Microsoft Teams is not expected to be impacted and can be leveraged in the interim while we mitigate the issue.
Current status: This is a continuation of a communication posted under CW1387674. We’ve identified an issue with a recent deployment for Microsoft Copilot. We’re reverting to a previous build to remediate impact as soon as possible. We expect this to be completed in the next 30 minutes.
Scope of impact: Our investigation indicates that any user or admin may be affected by this event. This section is subject to change as the investigation continues.
Start time: Thursday, June 11, 2026, at 8:00 PM UTC
Estimated time to resolve: We expect the reversion to be complete in the next 30 minutes.
Root cause: The root cause is still being investigated. We will provide more information in our next update.
Next update by: Thursday, June 11, 2026, at 10:00 PM UTC
Latest Microsoft 365 outages
Users cannot access Microsoft 365 Copilot Chat - about 6 hours ago
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