Microsoft has acknowledged and begun rolling out a fix for a troubling Exchange Online regression that left some Outlook mobile users unable to send or receive mail — a problem traced to Hybrid Modern Authentication (HMA) and tracked inside the Microsoft 365 Admin Center as incident EX1137017...
admin guidance
change validation
cloud optimization
ex1137017
exchange online
hma
hybrid identity
hybrid modern authentication
incident management
incident response
mail delivery delays
microsoft 365
mobile sync
outlook mobile
runbooks
service degradation
service health
sync quarantine
teams tm1134507
telemetry observability
