Resource Manager, our next-generation cloud infrastructure stack, is fully replacing the "classic" Service Management model. As a result, Service Management REST APIs and support for Service Bus, Relay, and Event Hubs will be retired on November 1, 2019. As with all changes of this type, we’re providing 12 months’ notice so you have adequate time to modify your services that use these APIs. For identification, these APIs have
management.core.windows.net in the URI.
To continue using Service Bus, Relay, and Event Hubs, please move to Resource Manager by October 31, 2019. We encourage all customers who are still using Service Management APIs to make the switch soon to take advantage of the additional benefits of Resource Manager, which include resource grouping, tags, a streamlined deployment and management process, and fine-grained access control using RBAC. For more information on Azure Resource Manager vs Service Management, please see the TechNet Blog.
For more information on Service Management and ARM APIs for Azure Service Bus, Relay and Event Hubs, please see our Azure Rest API documentation.