[German]On October 20, 2023, Microsoft 365 suite experienced a disruption. Users in Europe were unable to access several Microsoft 365 services or experienced loss of functionality. In particular, MS Teams users were affected and were unable to send messages, receive call notifications, or experience delays. I got also reports that Exchange Online had been affected. And administrators may not have been able to assign Microsoft Teams numbers to user accounts. Addendum: It was was power failure.
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German blog reader Andreas P. sent me the relevant information about the MO682702 incident from the Administrator Portal (thanks for that). Here is an excerpt.
Published Time: 20.10.2023 13:58:44 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 provided a Post-Incident Report within five business days Published Time: 20.10.2023 12:27:35 Title: Users in Europe may be unable to access multiple Microsoft 365 services or experience degraded functionality User impact: Users may be unable to access multiple Microsoft 365 services or experience degraded functionality. More info: The impacted services are as follows but not limited to: - Some users may be unable to access the Planner service - Some users may see a delay when viewing media sent in Microsoft Teams chat. - Some admins may be 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 experience delays of up to 2 hours receiving cyber alerts via Microsoft Defender for Endpoint. - Some users may experience delays to threat detection, hunting events, and accessing user pages within Microsoft Defender for Identity - Some users may have been unable to post messages, send messages or create thread within Microsoft Teams. - Some users may not receive call notifications within Microsoft Teams. - Some users using devices connected to SIP Gateway might not be able to call or use the device. - Some users may not be able to create breakout rooms. - Some users may not be able to start Teams Live Events. Current status: We've determined that a power event occurred in the West Europe region, causing users to be unable to connect to Microsoft 365 services or experience degraded functionality. We're restoring service and users should start to see signs of recovery. Scope of impact: Impact is specific to some users who are served through the affected infrastructure within Europe. Root cause: A power event has occurred in Azure's West Europe region, causing users to be unable to connect to Microsoft 365 services or experience degraded functionality. Next update by: Friday, October 20, 2023, at 12:30 PM UTC Published Time: 20.10.2023 11:06:11 Title: Users in Europe may be unable to access multiple Microsoft 365 services or experience degraded functionality User impact: Users may be unable to access multiple Microsoft 365 services or experience degraded functionality. More info: The impacted services are as follows but not limited to: - Some users may be unable to access the Planner service - Some users may see a delay when viewing media sent in Microsoft Teams chat. - Some admins may be unable to assign Microsoft Teams numbers to user accounts - Some users may be unable to tag other users within Microsoft Teams. - Some users may experience delays of up to 2 hours receiving cyber alerts via Microsoft Defender for Endpoint. - Some users may experience delays to threat detection, hunting events, and accessing user pages within Microsoft Defender for Identity Current status: We're reviewing service monitoring telemetry to isolate the root cause and develop a remediation plan. Scope of impact: Impact is specific to some users who are served through the affected infrastructure within Europe. Next update by: Friday, October 20, 2023, at 11:00 AM UTC
Addendum: It was was power failure. A reader forwarded the following explanation: "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."
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