I'm simply trying to extract the below information using Az PowerShell.

CodePudding user response：

The reason you're getting this error is because Az PowerShell module only support Cloud Services (Extended Support) and not Cloud Services (Classic).

One option for you is to migrate your classic Cloud Services to Cloud Services (Extended Support). You can learn more about the migration here: https://docs.microsoft.com/en-us/azure/cloud-services-extended-support/overview#migration-to-azure-resource-manager.

Another option (not sure if it is even viable) is to make use of really old version of Azure PowerShell (even before AzureRM) which has support for classic resources.