Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA)

A post-incident report has been published.

Title: Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) User impact: Users may have been unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may have included, but not been limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Final status: We've completed our restarts throughout the affected infrastructure and confirmed through telemetry and user reports that this issue is resolved. Scope of impact: Some users in Germany that attempted to access Microsoft 365 services listed in the More info section using GSA may have been impacted. Start time: Tuesday, October 13, 2026, at 7:40 AM UTC End time: Tuesday, October 13, 2026, at 6:31 PM UTC Root cause: A section of GSA infrastructure was performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next steps: - To help prevent similar impact in the future, we're further reviewing the GSA infrastructure and testing performance on the previously impacted portions of infrastructure. We'll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.

Title: Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs As a workaround, users may disable GSA to access the affected Microsoft 365 services until the resolution of this incident. Current status: We're finishing our restarts throughout the affected infrastructure and expect this will be complete and resolve all impact by Tuesday, October 13, 2026, at 7:00 PM UTC. Our telemetry is showing service recovery, and we'll continue to monitor to ensure full remediation. Scope of impact: Some users in Germany attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 7:40 AM UTC Preliminary root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 8:00 PM UTC

As a workaround, users may disable GSA to access the affected Microsoft 365 services until the resolution of this incident. This quick update is designed to give the latest information on this issue.

Title: Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're continuing our targeted restarts throughout the impacted infrastructure, and our telemetry shows services hosted on the restarted infrastructure are now operating at healthy service levels. We're also receiving confirmation that impact is resolved for some users. Scope of impact: Some users in Germany attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 7:40 AM UTC Preliminary root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 6:30 PM UTC

Title: Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're restarting a portion of impacted infrastructure where we've removed traffic and are seeing positive trends towards recovery. We've confirmed through internal testing that this resolves impact for some users and we're monitoring to validate the full recovery of the service. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 8:00 AM UTC Preliminary root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 5:30 PM UTC

Title: Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We've completed redirecting traffic to healthy infrastructure and are assessing for positive trends towards recovery. We're continuing to investigate additional mitigating actions to expedite remediation. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 8:00 AM UTC Preliminary root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 4:30 PM UTC

We're redirecting traffic from the underperforming infrastructure to improve service health. We're monitoring to confirm this will fully resolve impact. This quick update is designed to give the latest information on this issue.

Title: Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We've deployed the traffic optimizations and although we saw a reduction of errors initially, this did not fully resolve the issue. We're continuing to troubleshoot the issue to develop additional mitigation strategies. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 8:00 AM UTC Root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 3:30 PM UTC

Title: Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're continuing to apply the aforementioned traffic and performance optimizations with early signals showing signs of recovery. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Preliminary root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 3:30 PM UTC

Title: Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We’ve identified that a section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. We’re applying performance and traffic optimizations to remediate impact and restore connectivity. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Preliminary root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 1:30 PM UTC

Title: Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're reviewing service monitoring telemetry to isolate the source of the issue and establish a fix. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Next update by: Tuesday, October 13, 2026, at 11:30 AM UTC