Microsoft is investigating a widespread and ongoing Microsoft 365 outage impacting Workplace internet apps and the Microsoft 365 admin middle.
Since this incident began hours in the past, Downdetector has obtained person experiences complaining about issues connecting to Outlook, OneDrive, and different Workplace 365 apps and providers.
Affected clients see “We’re experiencing a service outage. All of your open files have been saved. It may be some time before the outage is resolved.” messages when attempting to view or entry their Microsoft 365 apps utilizing an online browser.
“We’re focussing our investigation on token generation within our authentication infrastructure. In parallel, we’re reviewing recent changes to determine the root cause,” Microsoft mentioned in an incident alert revealed within the admin middle.
“Impact is specific to some users, who are served through the affected infrastructure, attempting to access apps in Microsoft 365 for the web.”
Microsoft advises affected customers to entry their Microsoft 365 apps and paperwork utilizing the desktop functions (if they’ve the required licenses) as a workaround.
For the time being, Microsoft’s service standing, service well being standing, and Microsoft 365 community well being standing pages at the moment present no points affecting the Microsoft 365 admin middle, the corporate’s community well being standing, web service supplier availability, and buyer community infrastructure.
A worldwide Microsoft 365 outage additionally impacted a number of providers and options two weeks in the past, together with Microsoft Groups, Alternate On-line, SharePoint On-line, OneDrive, Purview, Copilot, and Outlook Net and Desktop.
The incident was resolved after greater than 24 hours, with the corporate saying it was nonetheless “addressing lingering issues with Outlook on the web” and “investigating mail queuing delays causing longer delivery times.”
In July, one other large outage took down a number of Azure and Microsoft 365 providers, just like the admin middle, Intune, Entra, Energy BI, and Energy Platform providers.
Someday later, Redmond admitted that the nine-hour outage was triggered by a distributed denial-of-service (DDoS) assault amplified by an error in its DDoS safety mechanisms.
Replace December 10, 07:55 EST: Microsoft is at the moment testing a possible repair that’s anticipated to resolve these ongoing points.
“While we continue to investigate the root cause, we’ve identified a token generation issue which may be contributing towards the impact. We’re testing a fix to revert to an alternate token generation flow, which we believe will resolve the issue,” the corporate mentioned.
Replace December 10, 08:18 EST: Microsoft has deployed a repair anticipated to mitigate the outage inside two hours.
“We’ve disabled proactive caching to provide some relief. In parallel, we’ve tested and deployed a fix, which we believe will remediate impact. We anticipate that the fix will take approximately two hours to complete,” Redmond mentioned in a brand new Microsoft 365 admin middle replace.
Replace December 10, 09:54 EST: Microsoft says the outage resulted from a current service change that launched a difficulty with figuring out the token expiry time, inflicting authentication requests to fail.
The corporate has confirmed the difficulty is now resolved after a interval of monitoring service telemetry.
