Microsoft 365 Outage Caused by WAN Router IP Address Change
Microsoft explained that the disruption was caused by a router IP address change during a planned maintenance update on January 25. It had broken connections between client devices and Azure. The problem impacted Exchange Online, Teams, Outlook, OneDrive for Business, SharePoint Online, Microsoft Intune, PowerBi, Microsoft Graph, M365 Admin Portal, Microsoft Defender for Identity, and Microsoft Defender for Cloud Apps
