I am trying to create the following resources in Azure using **Terraform** and **Terraform provider for Azure**.

* Create a storage account for blob storage.
* Create an event subscription that will raise events on blob activity.

When running the terraform scripts i get the following error 

> 
> Error: Error creating/updating EventGrid Event Subscription
>  "evtFileReceived" (Scope
>  "/subscriptions/c17cf5ee-d3d7-4f64-b863-f2a4d6948594/resourceGroups/dominos-doodle"):
>  eventgrid.EventSubscriptionsClient#CreateOrUpdate: Failure sending
>  request: StatusCode=400 -- Original Error: Code="InvalidRequest"
>  Message="The specified topic property does not match the expected
>  topic from the event subscription scope."
> 
> 
> 

How shoud i fix it ?. Google search didn't gave any results.   

The script that generated the error is as follows. The step that throwed the error is `terraform apply`

Obviously one way is to use the ARM templates to achieve this, but i am trying to see if it can be created using native Terraform scripts. I referred to [Terraform Docs](https://www.terraform.io/docs/providers/azurerm/r/eventgrid_event_subscription.html#webhook_endpoint) and created the following. 

```
variable "inp_resource_group_name" { }
variable "inp_geo_location" { }
variable "inp_account_name" { }
variable "inp_az_subscription_id" { }
variable "inp_resource_group_id" { }

resource "azurerm_storage_account" "cave" {
  name                     = var.inp_account_name
  resource_group_name      = var.inp_resource_group_name
  location                 = var.inp_geo_location
  account_tier             = "Standard"
  account_replication_type = "LRS"
  account_kind             = "StorageV2"
}

resource "azurerm_storage_container" "validName" {
  name                  = validName"
  resource_group_name   = var.inp_resource_group_name
  storage_account_name  = var.inp_account_name
  container_access_type = "blob"
}

resource "azurerm_eventgrid_event_subscription" "evtFileReceived" {
  name  = "evtFileReceived"
  scope = var.inp_resource_group_id
  topic_name="/subscriptions/${var.inp_az_subscription_id}/resourceGroups/${var.inp_resource_group_name}/providers/Microsoft.Storage/storageAccounts/{var.inp_account_name}"
  webhook_endpoint {
    url = "https://myendpoint.that.works.well.across.all.osi.layers"
  }
}

```