“Microsoft has advised users of its ExpressRoute Gateway, VPN Gateway, and Azure VMware service that they may experience degraded or interrupted network connectivity, and struggle to perform some network management operations.”
Microsoft patched its own network infrastructure and broke ExpressRoute, VPN Gateway, and Azure VMware in 18 regions. It still does not know why. It found a “correlation” with its own maintenance and paused it. Some components never recovered on their own.