Title: Users in Europe may have been unable to access multiple Microsoft 365 services or experience degraded functionality
User impact: Users may have been unable to access multiple Microsoft 365 services or experience degraded functionality.
More info: The impacted services were included, but were not limited to:
Planner service:
– Some users may have been unable to access the Planner service.
Microsoft Teams:
– Some users may have seen a delay when viewing media sent in Microsoft Teams chat.
– Some admins may have been unable to assign Microsoft Teams numbers to user accounts.
– Some users may have been unable to tag other users within Microsoft Teams.
– Some users may have been unable to post messages, send messages or create thread within Microsoft Teams.
– Some users may not have received call notifications within Microsoft Teams.
– Some users using devices connected to SIP Gateway might not have been able to call or use the device.
– Some users may not have been able to create breakout rooms.
– Some users may not have been able to start Teams Live Events.
Microsoft Defender Services:
– Some users may have experienced delays of up to 2 hours receiving cyber alerts via Microsoft Defender for Endpoint.
– Some users may have experienced delays in threat detection, hunting events, and accessing user pages within Microsoft Defender for Identity.
SharePoint Online:
– Some users may have experienced delays when accessing SharePoint Online sites.
Final status: We’ve restored the affected services by rerouting traffic to alternate regions to bypass the power event caused in Western Europe. Although the majority of impact was successfully restored on Friday, October 20, 2023, at approximately 8:00 AM UTC, there may have been a small amount of residual impact for some service. All services had fully recovered by Friday, October 20, 2023, at 10:22 AM UTC.
Scope of impact: Impact was specific to some users who were served through the affected infrastructure within Europe.
Start time: Friday, October 20, 2023, at 7:31 AM UTC
End time: Friday, October 20, 2023, at 10:22 AM UTC
Preliminary root cause: A power event impacted a subset of infrastructure in a single Availability Zone in the West Europe region. We’ll provide more information within the Post-Incident Report.
Next steps:
– We’ll continue to closely monitor the affected environment to ensure the service remains healthy, and we’ll review our service resilience processes to help us reduce or avoid similar issues in the future.
We’ll provide a Post-Incident Report within five business days
