ARM Template Extension to use DSC to add a replica Domain Controller to an existing Active Directory Domain

CreateReplicaDC_ARM_Extension.json

{
      "type": "Microsoft.Compute/virtualMachines/extensions",
      "name": "[concat(parameters('DC02VMName'),'/CreateReplicaDC')]",
      "apiVersion": "2015-05-01-preview",
      "location": "[resourceGroup().location]",
      "dependsOn": [
        "[concat('Microsoft.Compute/virtualMachines/', parameters('DC02VMName'))]",
        "Microsoft.Resources/deployments/UpdateDC02NIC",
        "[concat('Microsoft.Compute/virtualMachines/',parameters('DC01VMName'),'/extensions/CreateADForest')]"
      ],
      "properties": {
        "publisher": "Microsoft.Powershell",
        "type": "DSC",
        "typeHandlerVersion": "2.19",
        "autoUpgradeMinorVersion": true,
        "settings": {
          "ModulesUrl": "[variables('CreateReplicaDCPackageURL')]",
          "ConfigurationFunction": "[variables('CreateReplicaDCConfigurationFunction')]",
          "Properties": {
            "DomainName": "[parameters('domainName')]",
            "AdminCreds": {
              "UserName": "[parameters('adminUserName')]",
              "Password": "PrivateSettingsRef:AdminPassword"
            }
            "SafemodeAdminCreds": {
              "UserName": "[parameters('safemodeAdminUserName')]",
              "Password": "PrivateSettingsRef:safemodeAdminPassword"
            }
          }
        },
        "protectedSettings": {
          "Items": {
            "AdminPassword": "[parameters('adminPassword')]",
            "safemodeAdminPassword": "[parameters('safemodeAdminPassword')]",
          }
        }
      }
    },