Azure ExpressRoute Gateway Zone Redundant Gateway ARM Tempate

Question

I want to create a Zone-redudant ExpressRoute Gateway using ARM templates, however I always get this error below

"message": "Virtual network gateway Sku specified is not valid for gateway /subscriptions/xxxxxxxx/resourceGroups/NSPRG/providers/Microsoft.Network/virtualNetworkGateways/ERGw 

with DeploymentType CloudService. The allowed Skus are Standard,HighPerformance,UltraPerformance.",

The ARM template code I'm using is below...editor is VSCode

 {
    "apiVersion": "2020-06-01",
    "type": "Microsoft.Network/virtualNetworkGateways",
    "name": "[parameters('ERgatewayName')]",
    "location": "[parameters('location')]",
    "dependsOn": [
      "[resourceId('Microsoft.Network/publicIPAddresses/', parameters('gatewayPublicIPName'))]",
      "[resourceId('Microsoft.Network/virtualNetworks/', parameters('virtualNetworkName'))]",
    "[resourceId('Microsoft.Network/virtualNetworkGateways', parameters('gatewayName'))]",
      "[resourceId('Microsoft.Network/localNetworkGateways', parameters('localGatewayName'))]"
    ],
    "properties": {
      "ipConfigurations": [
        {
          "properties": {
            "privateIPAllocationMethod": "Dynamic",
            "subnet": {
              "id": "[variables('gatewaySubnetRef')]"
            },
            "publicIPAddress": {
              "id": "[resourceId('Microsoft.Network/publicIPAddresses',parameters('ERgatewayPublicIPName'))]"
            }
          },
          "name": "ERvnetGatewayConfig"
        }
      ],
      "gatewayType": "[parameters('ERgatewayType')]" ,
      "sku": {
          "name":"ErGw3AZ",
          "tier":"ErGw3AZ"
      }
    
    
    }
  }

Please what could be the issue here

Answer 1

As the document stated:

Zone-redundant gateways and zonal gateways both rely on the Azure public IP resource Standard SKU. The configuration of the Azure public IP resource determines whether the gateway that you deploy is zone-redundant, or zonal. If you create a public IP resource with a Basic SKU, the gateway will not have any zone redundancy, and the gateway resources will be regional.

for the error message, the public IP was the issue. We need to have a public IP resource Standard SKU for Zone-redundant gateways.