ZDNET.COM is reporting Office 365, Dynamics 365, Azure Government Cloud impacted by authentication issue. Microsoft engineers blamed the issue on Azure Active Directory (AAD), the company's identity and access management cloud solution that provides authentication services for Microsoft's cloud services. On the Azure status page, Microsoft indicated that the source of the problem is with Level 3, an US-based ISP that provides connectivity and various other services to Microsoft data centers. On the DownDetector portal, some users also reported having issues logging into Skype as well. The DownDetector page also suggests in the comments that FLUSHING the DNS and/or moving to the public 126.96.36.199 DNS is helpful.