无法将VMSS组合部署到ARM部署

{
  "type": "Microsoft.Compute/virtualMachineScaleSets",
  "name": "myVMSS",
  "apiVersion": "2021-04-01",
  "location": "eastus",
  "sku": {
    "name": "Standard_DS1_v2",
    "tier": "Standard",
    "capacity": 2
  },
  "properties": {
    "overprovision": false,
    "upgradePolicy": {
      "mode": "Automatic"
    },
    "virtualMachineProfile": {
      "storageProfile": {
        "osDisk": {
          "createOption": "FromImage",
          "caching": "ReadWrite"
        },
        "imageReference": {
          "publisher": "MicrosoftWindowsServer",
          "offer": "WindowsServer",
          "sku": "2019-Datacenter",
          "version": "latest"
        }
      },
      "osProfile": {
        "computerNamePrefix": "vmss",
        "adminUsername": "adminUser",
        "adminPassword": "adminPassword"
      },
      "networkProfile": {
        "networkInterfaceConfigurations": [
          {
            "name": "nicconfig",
            "properties": {
              "primary": true,
              "ipConfigurations": [
                {
                  "name": "ipconfig",
                  "properties": {
                    "subnet": {
                      "id": "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Network/virtualNetworks/{vnetName}/subnets/{subnetName}"
                    }
                  }
                }
              ]
            }
          }
        ]
      }
    }
  }
}