Azure service tags REST API and subscription level rights
To use servicetags api you have to register Microsoft.Netowork resource provider at azure subscription level.


Instead you can use these api:
to get the ip address list of  a specified Azure Service in a specified Azure region:
https://azinfo.azurewebsites.net/api/servicetags/{regionName}/{serviceName}
to get valid region names
https://azinfo.azurewebsites.net/api/GetRegionNameList
to get valid service names
https://azinfo.azurewebsites.net/api/GetServiceNameList
to get the all the ip address list of all Azure Services in a specified Azure region
https://azinfo.azurewebsites.net/api/region/{regionName}