Microsoft is investigating an ongoing outage blocking customers worldwide from accessing and using web apps and online services.
The list of affected services includes Microsoft 365 fort the web, the Microsoft 365 suite, Microsoft Teams, and Microsoft Planner.
According to reports, customers are experiencing problems when trying to sign into their accounts and will see that no web apps are available once in.
“We’re investigating access issues with Microsoft 365 Online apps and the Teams admin center. Further information can be found under OO544150 within the Microsoft 365 admin center,” the company tweeted earlier today.
“Users may be intermittently unable to view or access web apps in Microsoft 365. We’re reviewing service monitoring telemetry to isolate the root cause and develop a remediation plan,” the admin center incident report says.
In some cases, a banner displayed at the top of the screen asks “new” users to reach out to their IT department to help with the issue.
“New to Microsoft 365? This is your Microsoft 365 home page where you can see and access all of your apps. If it’s empty, it could be that your user license was very recently assigned to you,” the notification reads.
“Wait 10 minutes and refresh this page. If you still don’t see any apps, contact your IT department. They can help you get up and running.”
We’re investigating access issues with Microsoft 365 Online apps and the Teams admin center. Further information can be found under OO544150 within the Microsoft 365 admin center.
— Microsoft 365 Status (@MSFT365Status) April 20, 2023
According to the latest updates provided by Microsoft in the admin center, the out was caused by caching infrastructure performing below acceptable performance thresholds and leading to timeout exceptions.
“Analysis of diagnostic data has identified an unusually high number of timeout exceptions within our caching and Azure Active Directory (AAD) infrastructure. We’re working to isolate the cause of these exceptions whilst identifying steps to remediate impact,” Microsoft said.
Another outage took down multiple Microsoft 365 services in January after a router IP address change caused packet forwarding issues between routers in Microsoft’s Wide Area Network (WAN).
Services affected by the January 2023 outage included Microsoft Teams, Exchange Online, Outlook, SharePoint Online, OneDrive, the Microsoft 365 Admin Center, Microsoft Graph, Microsoft Intune, and several Microsoft Defender products.
This is a developing story …
