10:00 AM - Microsoft engineers are actively investigating an ongoing issue affecting Azure Active Directory, when Multi-Factor Authentication is required by policy. Please refer to http://status.azure.com for updates.
12:26 PM - Microsoft engineers cycling of impacted servers is complete and initial telemetry and customer reports indicates issue is majority mitigated. Telemetry will continue until mitigation confirmed.
2:48 PM - Microsoft engineers have confirmed that the majority customers should no longer be experiencing symptoms for this issue. Customers that continue to experience issues with MFA are advised to open a support request.