We've confirmed that all systems are back to normal with no customer impact as of 11/24, 11:10 UTC. Our logs show the incident started on 11/24, 07:47 UTC and that during the 3 hours & 23 minutes that it took to resolve the issue some of customers experienced issues authenticating into Azure services.
Root Cause: The failure was due to an issue in Authentication service.
Incident Timeline: 3 Hours & 23 minutes - 11/24, 07:47 UTC through 11/24, 11:10 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Initial Update: Sunday, 24 November 2019 11:32 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers may experience issues authenticating into Azure services due to an Azure Active Directory issue.
Work Around: None
Next Update: Before 11/24 14:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Naresh