Issue Resolved at 10:30 am on 9/29/20: Microsoft 365 Authentication issues resolved were resolved as of 9/28 at 7 PM (MT) and all services are available.
Issue updated at 8:40 pm on 9/28/20: Customers may be unable to access any services that leverage Azure Active Directory (AAD) including Outlook, Microsoft Teams, and Teams Live Events as well as Office.com. Additionally, Power Platform and Dynamics365 properties are also affected by this incident. Existing customer sessions are not impacted and any user who is logged in to an existing session would be able to continue their sessions.
Issue updated at 5:50 PM on 9/28/2020: Microsoft is continuing to investigate the authentication issues which are impacting sign in to multiple Microsoft 365 services. We will continue to update as the vendor updates the case.
Issue reported at 3:45 PM on 9/28/2020: Microsoft 365 is currently experiencing an issue which is impacting sign in to multiple services, including Teams, SharePoint and possibly Outlook. We are waiting for more information from the vendor and will update as we know more.
Current status: Microsoft has confirmed via monitoring that the majority of services have recovered for most customers. However, they continue to see a small subset of customers whose tenants are located in North America region who are still impacted and now investigating mitigation steps for those customers who are still affected.
Scope of impact: Any user may experience access problems for Microsoft 365 services.
Start time: Monday, September 28, 2020, 3:25 PM (9:25 PM UTC)
Preliminary root cause: A portion of Microsoft infrastructure was not processing authentication requests in a timely manner and preventing users from being able to access multiple M365 services.
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