Microsoft.Compute/virtualMachines/write + Microsoft.Resources/deployments/write Error

[201-specialized-vm-in-existing-vnet](https://github.com/Azure/azure-quickstart-templates/blob/master/201-specialized-vm-in-existing-vnet/azuredeploy.json)
### Issue Details

Hey together

i have almost the same issue as this guy [https://github.com/Azure/azure-quickstart-templates/issues/1294] but my deployment crashes one step earlier.
Whats wrong with my template?

short explanation...
1. i want to deploy my own specialized vhd (new vm) on a existing vnet -> i use the azure portal (templates)
2. the vhd is inside a blob container with the rights of a container (uploadet via powershell)
3. i have an existing vnet with own subnet's
4. the vhd is non-sysprepped -> is the vhd fault?

so whats wrong with my deployment?


`{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"vmName": {
"type": "string",
"metadata": {
"description": "Name of the VM"
}
},
"osType": {
"type": "string",
"allowedValues": [
"Windows",
"Linux"
],
"metadata": {
"description": "Type of OS on the existing vhd"
}
},
"osDiskVhdUri": {
"type": "string",
"metadata": {
"description": "Uri of the existing VHD in ARM standard or premium storage"
}
},
"vmSize": {
"type": "string",
"metadata": {
"description": "Size of the VM"
}
},
"existingVirtualNetworkName": {
"type": "string",
"metadata": {
"description": "Name of the existing VNET"
}
},
"existingVirtualNetworkResourceGroup": {
"type": "string",
"metadata": {
"description": "Name of the existing VNET resource group"
}
},
"subnetName": {
"type": "string",
"metadata": {
"description": "Name of the subnet in the virtual network you want to use"
}
},
"dnsNameForPublicIP": {
"type": "string",
"metadata": {
"description": "Unique DNS Name for the Public IP used to access the Virtual Machine."
}
}
},
"variables": {
"api-version": "2015-06-15",
"publicIPAddressType": "Dynamic",
"vnetID": "[resourceId(parameters('existingVirtualNetworkResourceGroup'), 'Microsoft.Network/virtualNetworks', parameters('existingVirtualNetworkName'))]",
"subnetRef": "[concat(variables('vnetID'),'/subnets/', parameters('subnetName'))]",
"nicName": "[parameters('vmName')]",
"publicIPAddressName": "[parameters('vmName')]"
},
"resources": [
{
"apiVersion": "[variables('api-version')]",
"type": "Microsoft.Network/publicIPAddresses",
"name": "[variables('publicIPAddressName')]",
"location": "[resourceGroup().location]",
"tags": {
"displayName": "PublicIPAddress"
},
"properties": {
"publicIPAllocationMethod": "[variables('publicIPAddressType')]",
"dnsSettings": {
"domainNameLabel": "[parameters('dnsNameForPublicIP')]"
}
}
},
{
"apiVersion": "[variables('api-version')]",
"type": "Microsoft.Network/networkInterfaces",
"name": "[variables('nicName')]",
"location": "[resourceGroup().location]",
"dependsOn": [
"[concat('Microsoft.Network/publicIPAddresses/', variables('publicIPAddressName'))]"
],
"tags": {
"displayName": "NetworkInterface"
},
"properties": {
"ipConfigurations": [
{
"name": "ipconfig1",
"properties": {
"privateIPAllocationMethod": "Dynamic",
"publicIPAddress": {
"id": "[resourceId('Microsoft.Network/publicIPAddresses',variables('publicIPAddressName'))]"
},
"subnet": {
"id": "[variables('subnetRef')]"
}
}
}
]
}
},
{
"apiVersion": "[variables('api-version')]",
"type": "Microsoft.Compute/virtualMachines",
"name": "[parameters('vmName')]",
"location": "[resourceGroup().location]",
"tags": {
"displayName": "VirtualMachine"
},
"dependsOn": [
"[concat('Microsoft.Network/networkInterfaces/', variables('nicName'))]"
],
"properties": {
"hardwareProfile": {
"vmSize": "[parameters('vmSize')]"
},
"storageProfile": {
"osDisk": {
"name": "[concat(parameters('vmName'))]",
"osType": "[parameters('osType')]",
"caching": "ReadWrite",
"vhd": {
"uri": "[parameters('osDiskVhdUri')]"
},
"createOption": "Attach"
}
},
"networkProfile": {
"networkInterfaces": [
{
"id": "[resourceId('Microsoft.Network/networkInterfaces',variables('nicName'))]"
}
]
}
}
}
]
}`
thanks for help
Mattias

Start with 201-specialized-vm-in-existing-vnet/azuredeploy.json and the reported Microsoft.Compute/virtualMachines/write and Microsoft.Resources/deployments/write errors; inspect the existing VNet, subnet references, and specialized VHD inputs before reproducing the deployment. Done means the template’s cause is identified and a documented correction is validated by a successful deployment.

Written by the indexing model from the issue text.