Microsoft 365 Alert : Service degradation – Exchange Online – Users may be unable to access Outlook on the web or use some features across Microsoft 365 services – RESOLVED

05-10-2021 08:26:00 AM (BST)

Issue Reported: 04/10/2021 10:42:00 PM

Microsoft Reference : MO289250

Issue Status: RESTORED

Issue Description: Users may have been unable to access Outlook on the web or utilize some features across Microsoft 365 services.

More info: The following impact scenarios may have affected your users:

-Users may have been unable to access Outlook on the web.
-The search feature may have not worked in Exchange Online, Microsoft Teams, and SharePoint Online.
-eDiscovery data may have been inaccessible for Exchange Online or Microsoft Teams.
-Uploaded files to Microsoft Teams may have been temporarily inaccessible.
-Microsoft Security Center (MSC) and Security and Compliance Center (SCC) sign in may have been impacted and users may have run into “Resource not found” errors when loading policies. Additionally, other scenarios in those centers may have shown permissions/Role Based Access Control (RBAC) errors.
-On-premises mailflow could’ve caused queuing although impact should’ve been minimally impacting.

Scope of impact: This issue could’ve affected any user attempting to access Outlook on the web or other Microsoft 365 services and features as listed in the more info section.

Final Update – 05/10/2021 08:26:00 AM: Microsoft has reached acceptable levels of service availability and confirmed via extensive monitoring that the the issue has been mitigated for all previously impacted environments.