Microsoft MFA outage blocking access to Microsoft 365 apps

Microsoft is investigating a Microsoft 365 MFA outage that blocks access to Office apps and disrupts MFA registration/reset, while also probing reports of application crashes on Windows Server 2016; traffic is being redirected to healthy infrastructure during remediation. The report references recent related service issues, including product deactivation errors and prior outages affecting Office web apps, Teams, Exchange Online, SharePoint Online, OneDrive, Purview, Copilot, and Outlook, and notes that this remains a developing story.