如何在链接模板中使用Azure Key Vault secret

我正在尝试根据KeyVault secret创建自动化变量。我假设我可以做与当前在主模板中检索windows密码相同的事情,但由于下面的非描述性错误而失败。不确定下一步应如何进行故障排除。

错误

{
  "code": "BadRequest",
  "message": "{\"Message\":\"The request is invalid.\",\"ModelState\":{\"variable.properties.value\":[\"An error has occurred.\"]}}"
}

样板

{
                  "name": "mystring",
                  "type": "variables",
                  "apiVersion": "2015-10-31",
                  "dependsOn": [
                    "[concat('Microsoft.Automation/automationAccounts/', parameters('AutomationAccountName'))]"
                  ],
                  "properties": {
                    "value": {
                      "reference": {
                        "keyVault": {
                          "id": "[resourceId(subscription().subscriptionId, 'Utility-RG', 'Microsoft.KeyVault/vaults', 'MyKeyVault')]"
                        },
                        "secretName": "WindowsPasswordSecret"
                      }
                    },
                    "description": "test var",
                    "isEncrypted": false
                  }
                }