Latham & Watkins

We are providing an update on the ongoing service disruption. The Middle East (UAE) Region (ME-CENTRAL-1) has suffered damage as a result of the conflict in the Middle East and is currently unable to reliably support customer applications. While some workloads continue to function normally, we strongly recommend customers migrate all accessible resources to other Regions and restore inaccessible resources from remote backups as soon as possible. Relevant billing operations are currently suspended while we restore normal operations in this AWS Region. This process is expected to take several months.

The issue has been identified and a fix is being implemented.

Title: Users may be unable to connect to, or experience degraded functionality with Exchange Online User impact: Users may be unable to connect to, or experience degraded functionality with Exchange Online. More info: We've confirmed that the authentication component issue impacts other services beyond Exchange Online. For more information regarding other impact scenarios, please see: MO1465074. We've opted to keep this post (EX1464935) open as Exchange Online remains the most predominantly impacted service. Users may experience a variety of symptoms related to this event, including but not limited to: - Delays, failures, or incomplete results when searching for content within Exchange Online mailboxes. - Delays or failures when sending or receiving email messages. - Authentication-related errors when accessing Exchange Online services. - Difficulties accessing or performing actions within Exchange administration experiences. - Intermittent failures affecting mailbox operations and message delivery work Current status: We're continuing to apply the targeted authentication component fix across the remaining affected infrastructure where necessary. Service telemetry continues to indicate recovery, with availability increasing across previously impacted scenarios as remediation progresses. We're validating that authentication, connectivity and search operations are returning to expected service levels while monitoring for any residual impact and confirming that the remediation is delivering broad mitigation across affected Exchange Online scenarios. As recovery signals continue to trend positively, we're maintaining extended monitoring across affected service workflows to ensure improvements are sustained. Scope of impact: This issue may impact users attempting to send or receive email messages through Exchange Online. We're continuing our investigation to determine the full scope of affected scenarios and will provide additional information as it becomes available. Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 4:00 PM UTC

Title: Users may experience issues when utilizing multiple Microsoft 365 services User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Microsoft Teams: - Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. - Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: - Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: - Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Current status: We're continuing to apply the targeted authentication component fix across the remaining affected infrastructure where necessary. Service telemetry continues to indicate recovery, with availability increasing across previously impacted scenarios as remediation progresses. We're validating that authentication, connectivity and search operations are returning to expected service levels while monitoring for any residual impact and confirming that the remediation is delivering broad mitigation across affected Exchange Online scenarios. As recovery signals continue to trend positively, we're maintaining extended monitoring across affected service workflows to ensure improvements are sustained. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 4:00 PM UTC

We have applied the mitigation and are monitoring the recovery.

Title: Some users may be unable to access SharePoint Online sites configured with Authentication Context User impact: Users may be unable to access SharePoint Online sites configured with Authentication Context. More info: Specifically, users are unable to access SharePoint Online sites configured with Authentication Context through sensitivity labels. Users receive the following error message: "Server Error in '/' Application." As a workaround, users may be able to temporarily access the affected content by first clearing internet browser cookies and navigating to the root site collection before opening the direct link. Users could also open a new browser tab on the same session and access the site. The link may work as well. Current status: We've determined that reverting the update suspected of causing this issue isn't a viable path to remediation. We're reviewing alternative solutions to confirm the impact and resolve the problem. Scope of impact: Some users attempting to access SharePoint Online sites configured with Authentication Context through sensitivity labels may be impacted. Next update by: Tuesday, September 1, 2026, at 7:00 PM UTC

Engineering has completed remediation activities and is monitoring recovery. Device visibility has been restored for most affected instances, and some affected device listings may take up to 24 hours to fully reappear as backend refresh processes complete. We appreciate your patience while we addressed this service incident.

We continue to work on a fix for this issue and will provide updates as soon as there is more information to share. Thank you for your patience.