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Template validation reports parameter value not specified when it uses a keyvault reference

See original GitHub issue

Hi,

This is more of a nit as I haven’t been blocked by this error. In VSCode, I have a parameter for a storage prefix (which comes from the parameter file); that is then referenced in a variable which concats it with a uniqueString

azuredeploy.json

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "location": {
            "type": "string",
            "defaultValue": "[resourceGroup().location]",
            "metadata": {
                "description": "Location where resource(s) will be created"
            }
        },
        "storagePrefix": {
            "type": "string",
            "minLength": 3,
            "maxLength": 11
        },
        "storageSKU": {
            "type": "string",
            "defaultValue": "Standard_LRS",
            "allowedValues": [
                "Standard_LRS",
                "Standard_GRS",
                "Standard_RAGRS",
                "Standard_ZRS",
                "Premium_LRS",
                "Premium_ZRS",
                "Standard_GZRS",
                "Standard_RAGZRS"
            ]
        }
    },
    "variables": {
        "uniqueStorageName": "[concat(parameters('storagePrefix'), uniqueString(resourceGroup().id))]"
    },
    "resources": [
        {
            "type": "Microsoft.Storage/storageAccounts",
            "apiVersion": "2019-06-01",
            "name": "[variables('uniqueStorageName')]",
            "location": "[parameters('location')]",
            "sku": {
                "name": "[parameters('storageSKU')]"
            },
            "kind": "StorageV2",
            "properties": {
                "networkAcls": {
                    "bypass": "AzureServices",
                    "virtualNetworkRules": [],
                    "ipRules": [],
                    "defaultAction": "Allow"
                },
                "supportsHttpsTrafficOnly": true,
                "encryption": {
                    "services": {
                        "file": {
                            "keyType": "Account",
                            "enabled": true
                        },
                        "blob": {
                            "keyType": "Account",
                            "enabled": true
                        }
                    },
                    "keySource": "Microsoft.Storage"
                },
                "accessTier": "Hot"
            }
        }
    ]
}

azuredepoy.parameters.dev.json

{
    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentParameters.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "location": {
            "value": "westus"
        },
        "storagePrefix": {
            "value": "stcmadcm"
        },
        "storageSKU": {
            "value": "Standard_LRS"
        }
    }
}

The deployment, both in test and prod work fine without any errors, however within VS Code I get this error in the PROBLEMS tab Template validation failed: The value for the template parameter 'storagePrefix' at line '12' and column '26' is not provided. Please see https://aka.ms/arm-deploy/#parameter-file for usage details.

I do have the latest version of VSCode installed.

Let me know if there is anything else I can provide to help with this