Microsoft 365

Title: Users are unable to access Microsoft 365 Copilot Chat or portal.office.com User impact: Users are unable to access Microsoft 365 Copilot Chat or portal.office.com. More info: Admins may be able to access the Microsoft 365 admin center via admin.cloud.microsoft as a temporary solution. Additionally, Copilot in Microsoft Teams is not expected to be impacted and can be leveraged in the interim while we mitigate the issue. Current status: This is a continuation of a communication posted under CW1387674. We’ve identified an issue with a recent deployment for Microsoft Copilot. We’re reverting to a previous build to remediate impact as soon as possible. We expect this to be completed in the next 30 minutes. Scope of impact: Our investigation indicates that any user or admin may be affected by this event. This section is subject to change as the investigation continues. Start time: Thursday, June 11, 2026, at 8:00 PM UTC Estimated time to resolve: We expect the reversion to be complete in the next 30 minutes. Root cause: The root cause is still being investigated. We will provide more information in our next update. Next update by: Thursday, June 11, 2026, at 10:00 PM UTC

Title: Users may be experiencing significant delays in sending and receiving email messages in Exchange Online User impact: Users may be experiencing significant delays in sending and receiving email messages in Exchange Online More info: Users are experiencing significant delays in sending and receiving email messages, with some email messages remaining undelivered for over an hour. Current status: We’re analyzing support case details to determine the next steps needed to resolve this issue. Scope of impact: Impact is specific to users located in North America and Germany attempting to send and receive email messages in Exchange Online. Next update by: Tuesday, June 02, 2026, at 4:30 PM UTC

Title: Unable to open files in Office for the web. User impact: Users may be unable to open files in Office for the web. More info: Impacted Office Apps include, but are not limited to: - Excel When users open documents, impacted users are shown the following the following error message "Office Online services aren't available right now. We're working to restore all services as soon as possible. Please check back soon." Current status: We're investigating service telemetry to isolate the source of the issue. Scope of impact: This issue could impact any user attempting to access Office Apps using Office for the web or Microsoft Teams. Next update by: Monday, June 1, 2026, at 2:30 PM UTC

Title: Possible delays or problems when accessing SharePoint Online User impact: Some customers have reported issues with accessing the service, or using features in SharePoint Online. Current status: We’re looking into your reported issue and checking for impact to your organization. We'll provide an update within one hour.

Title: Some users may be unable to setup Multi-Factor Authentication (MFA) or access the mysignins.microsoft.com website User impact: Users may be unable to setup MFA or access the mysignins.microsoft.com website. Current status: We've received reports indicating an issue with setting up MFA or accessing the mysignins.microsoft.com page. We're reviewing service health telemetry to help isolate the root cause and determine our next troubleshooting steps. Scope of impact: Some users attempting to setup MFA or accessing the mysignins.microsoft.com website may be impacted. Next update by: Monday, June 01, 2026, at 11:00 AM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online. Current status: We’re reviewing service telemetry to isolate the root cause of the issue and determine a fix. Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online. Next update by: Saturday, May 30, 2026, at 11:30 AM UTC

Title: Some admins may be unable to view usage reports in the Microsoft 365 admin center User impact: Admins may be unable to view usage reports in the Microsoft 365 admin center. Current status: We're reviewing support provided information to determine our next troubleshooting steps. Scope of impact: Some admins attempting to view usage reports in the Microsoft 365 admin center may be impacted. Next update by: Monday, May 25, 2026, at 4:30 PM UTC

Title: Potential issues accessing mailboxes via one or more connection methods User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods. Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 60 minutes.