[commercetools_subscription] Empty string as URI for Azure EventGrid topic

[philippeckelintive]

Information
Terraform version: 1.4.5
Provider version: 1.6.9
Resource: commercetools_subscription

To Reproduce
Steps to reproduce the behavior:

resource "commercetools_subscription" "subscription" {
  key = var.key
  destination {
    type       = "EventGrid"
    access_key = var.access_key
    uri        = var.uri
  }

  changes {
    resource_type_ids = ["product"]
  }

  format {
    type                 = "CloudEvents"
    cloud_events_version = "1.0"
  }

  message {
    resource_type_id = "product"
    types            = ["ProductPublished"]
  }
}

While terraform plan shows the correct URI for EventGrid, terraform apply fails with

"Error creating subscription","detail":"The URI '' is not an expected Azure URI (as in 'https://topic.region.eventgrid.azure.net/api/events')."