Microsoft 365 outage locks users out of services

Microsoft is investigating a Microsoft 365 outage that began on September 16 at 13:22 UTC. Users cannot sign in to services, with 5xx errors and upstream dependency issues reported.

• Outage began September 16 at 13:22 UTC
• Users cannot sign in to Microsoft 365 services
• 5xx errors and upstream dependency failures reported
• Microsoft is investigating the cause