Microsoft 365 Service Issues During October 2026
Service issues related to Microsoft 365 products for October 2026 as posted in Microsoft 365 Admin center. Below table provides an overview of currently active issues, recently resolved incidents, and a historical log of past advisories.
If you continue to experience the same issue, Incident ID is connected to admin center for latest update.
IsResolved | StartDate | LastModifiedDate | Issue ID | Issue Description |
FALSE | 10/30/2026 | 10/31/2026 | Users' Microsoft 365 Apps usage reports may show outdated data in the admin center | |
FALSE | 10/30/2026 | 10/30/2026 | Users are unable to access Notes in Outlook on the web | |
FALSE | 10/29/2026 | 10/31/2026 | Users may be unable to view recent portions of their conversation history with Microsoft 365 Copilot Chat | |
TRUE | 10/29/2026 | 10/30/2026 | External users? replies to encrypted email messages may not be delivered in Exchange Online | |
FALSE | 10/28/2026 | 10/30/2026 | Admins are unable to complete Microsoft OneDrive or SharePoint site migrations | |
TRUE | 10/28/2026 | 10/29/2026 | Users may not be able to open email file attachments or see the "Open" option in the new Outlook desktop app | |
TRUE | 10/28/2026 | 10/28/2026 | Some users may have been unable to access Microsoft Copilot across multiple Microsoft 365 applications | |
FALSE | 10/28/2026 | 10/30/2026 | Users may see an erroneous error when sharing agents with new owners in Microsoft Copilot Agent Builder | |
TRUE | 10/27/2026 | 10/28/2026 | Some users may see Azure Maps visuals are blank and aren't loading as expected in Microsoft Fabric | |
FALSE | 10/27/2026 | 10/29/2026 | Some users may be unable to load chat history or previously pinned chats, and can't pin chats in Microsoft 365 Copilot | |
TRUE | 10/27/2026 | 10/28/2026 | Some users may see intermittent failures when accessing Exchange Online through Representational State Transfer (REST) | |
TRUE | 10/27/2026 | 10/29/2026 | Users may be unable to open the SharePoint and Microsoft OneDrive file picker in Agent Builder within Microsoft Copilot | |
TRUE | 10/26/2026 | 10/26/2026 | Admins' Microsoft Defender XDR advanced hunting queries that contain a customer-defined function may have failed | |
TRUE | 10/26/2026 | 10/26/2026 | Some users may be unable to access the group feed with Microsoft Viva Engage | |
TRUE | 10/23/2026 | 10/29/2026 | Admin usage reports for Microsoft 365 apps and Exchange Online may have refresh delays | |
TRUE | 10/22/2026 | 10/23/2026 | Users may be unable to import .XLSX files in Microsoft Viva Glint | |
TRUE | 10/21/2026 | 10/22/2026 | The Microsoft Defender portal was not displaying affected products for some Common Vulnerabilities and Exposures (CVEs) | |
TRUE | 10/21/2026 | 10/22/2026 | SIP devices can't make or receive calls | |
TRUE | 10/21/2026 | 10/21/2026 | Users may be unable to access the group feed in Microsoft Viva Engage | |
TRUE | 10/21/2026 | 10/22/2026 | Users may be unable to perform migrations | |
TRUE | 10/21/2026 | 10/22/2026 | Admins may see delayed Microsoft 365 Copilot usage and Copilot Chat usage data in the Microsoft 365 admin center | |
TRUE | 10/20/2026 | 10/20/2026 | Some users may not receive responses from Microsoft 365 Copilot in the web and desktop apps | |
TRUE | 10/20/2026 | 10/21/2026 | Some users may not receive responses from Microsoft 365 Copilot Chat in the web and desktop apps | |
TRUE | 10/19/2026 | 10/19/2026 | Users and admins couldn't view or manage device group configurations through the Microsoft Defender portal | |
TRUE | 10/19/2026 | 10/20/2026 | Some users may be unable to join town hall meetings in Microsoft Teams and are redirected to a registration page | |
TRUE | 10/19/2026 | 10/19/2026 | Some users may have been unable to send messages in Microsoft 365 Copilot chat | |
TRUE | 10/19/2026 | 10/19/2026 | Some users may have experienced intermittent failures with sensitivity-labeled items in Microsoft Fabric | |
TRUE | 10/19/2026 | 10/28/2026 | Users may see delays populating data in the threat and vulnerability management tab in Microsoft Defender for Endpoint | |
TRUE | 10/19/2026 | 10/26/2026 | Some users may be unable to access or protect content using Azure Rights Management (ARM) across Microsoft 365 services | |
TRUE | 10/16/2026 | 10/29/2026 | Users may be unable to create SharePoint knowledge agents using Microsoft 365 Copilot in SharePoint Online | |
TRUE | 10/16/2026 | 10/20/2026 | Users may not see options to select GPT models in Microsoft 365 Copilot | |
TRUE | 10/16/2026 | 10/16/2026 | Some users' calls may fail in Microsoft Teams | |
FALSE | 10/14/2026 | 10/29/2026 | Admins may encounter delays in accessing audit log data results in Microsoft Purview Audit | |
TRUE | 10/14/2026 | 10/15/2026 | Some users may encounter refresh failures when using the Dynamics 365 Business Central connector in Power BI | |
TRUE | 10/14/2026 | 10/30/2026 | Users that have premium license for Microsoft Defender for Servers (DFS) P2 may not see baseline data | |
TRUE | 10/14/2026 | 10/22/2026 | Some users were unable to see model selection options in Microsoft 365 Copilot chat | |
TRUE | 10/13/2026 | 10/16/2026 | Some users may not receive meeting-started notifications on Android devices | |
TRUE | 10/13/2026 | 10/21/2026 | Users may be unable to access multiple Microsoft 365 services using Global Secure Access (GSA) | |
TRUE | 10/12/2026 | 10/13/2026 | Admins may be unable to review Service health or Message center postings in the Microsoft 365 admin center | |
FALSE | 10/12/2026 | 10/30/2026 | Users' Microsoft Teams contact cards may not fully display Out of office text | |
FALSE | 10/12/2026 | 10/14/2026 | Some users may be missing the "Meeting options" button for Microsoft Teams meetings in multiple Microsoft 365 apps | |
TRUE | 10/12/2026 | 10/19/2026 | Admins are unable to access the Exchange admin center (EAC) | |
TRUE | 10/12/2026 | 10/12/2026 | Users may have been unable to access or protect content using Azure Rights Management (ARM) in Microsoft 365 services | |
TRUE | 10/12/2026 | 10/21/2026 | Users may be unable to view or modify custom forms in SharePoint Online | |
TRUE | 10/11/2026 | 10/16/2026 | Some users may be unable to create or publish assignments in Microsoft OneNote | |
TRUE | 10/9/2026 | 10/16/2026 | Users may be unable to download webinar registration details from the Events app in Microsoft Teams | |
TRUE | 10/9/2026 | 10/9/2026 | Some users may be unable to access Microsoft Teams transcripts and recordings | |
TRUE | 10/8/2026 | 10/8/2026 | Some users' email messages from on-premises Exchange servers to Exchange Online may intermittently fail | |
TRUE | 10/8/2026 | 10/8/2026 | Some users may receive failures when prompting Microsoft 365 Copilot in Outlook on the web or the Outlook desktop client | |
TRUE | 10/7/2026 | 10/7/2026 | Some admins may be unable to access the Action center in the Microsoft Defender portal | |
TRUE | 10/7/2026 | 10/16/2026 | Users may be unable to join Microsoft Teams meetings and see sign-in errors | |
TRUE | 10/6/2026 | 10/13/2026 | Admin may see status cards displaying "Unknown" instead of the expected summary counts in Intune admin center | |
TRUE | 10/6/2026 | 10/7/2026 | Users may be unable to interact with the Microsoft 365 Copilot voice experience | |
TRUE | 10/6/2026 | 10/7/2026 | Users are unable to create or edit new meeting or broadcast events in Microsoft Viva Engage | |
TRUE | 10/6/2026 | 10/9/2026 | Users may not see chart data when using standard light or dark themes on Power BI dashboards | |
FALSE | 10/6/2026 | 10/30/2026 | Users may be unable to view contacts and Speed Dial entries in Microsoft Teams, Outlook desktop and mobile | |
TRUE | 10/6/2026 | 10/8/2026 | Users may have experienced alert and activity delays and unexpected CAAC policy behavior in Microsoft Defender XDR | |
FALSE | 10/6/2026 | 10/28/2026 | Users may see Microsoft Teams on the web displayed in English | |
TRUE | 10/5/2026 | 10/6/2026 | Some users may be unable to create or update Ontology artifacts in Microsoft Fabric | |
TRUE | 10/5/2026 | 10/6/2026 | Admins intermittently may be unable to access the Microsoft 365 admin center | |
TRUE | 10/5/2026 | 10/6/2026 | Admins intermittently may be unable to access the Microsoft 365 admin center | |
TRUE | 10/5/2026 | 10/5/2026 | Some users may be unable to search using the search box in SharePoint Online | |
TRUE | 10/5/2026 | 10/23/2026 | Users may be seeing unexpected users when changing accounts in Microsoft 365 Copilot Chat | |
TRUE | 10/5/2026 | 10/5/2026 | Some users may experience degraded audio and video quality during Microsoft Teams meetings and calls | |
TRUE | 10/1/2026 | 10/13/2026 | Some users may experience intermittent audio and video degradation when using Microsoft Teams through VDI 2.0 | |
TRUE | 10/1/2026 | 10/1/2026 | Users may have experienced errors or failures when trying to access the Microsoft Teams web client and join meetings |
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