Identity Provider Outage: The On-Call Blast Radius
An identity provider outage is the one failure mode where your dashboards stay green and your entire company stops working anyway. On August 31, 2026, Microsoft acknowledged a widespread Exchange Online incident at 5:30 PM UTC, tracked as EX1464935, and described it in the admin center as "a common failure pattern across affected Exchange Online requests that is associated with authentication and protocol connectivity." Tens of thousands of users were affected according to Downdetector.