问为什么Terraform没有提供google_cloudfunctions_function_iam_member？

EN

google_cloudfunctions_function_iam_member.v2invoker: Creating...
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│ Error: Error applying IAM policy for cloudfunctions cloudfunction "projects/myproject/locations/us-central1/functions/v2": Error setting IAM policy for cloudfunctions cloudfunction "projects/myproject/locations/us-central1/functions/v2": googleapi: Error 403: Permission 'cloudfunctions.functions.setIamPolicy' denied on resource 'projects/myproject/locations/us-central1/functions/v2' (or resource may not exist).
│ 
│   with google_cloudfunctions_function_iam_member.v2invoker,
│   on main.tf line 460, in resource "google_cloudfunctions_function_iam_member" "v2invoker":
│  460: resource "google_cloudfunctions_function_iam_member" "v2invoker" {

resource "google_cloudfunctions_function" "v2" {
  name                  = "v2"
  runtime               = "nodejs12"
  available_memory_mb   = 128
  source_archive_bucket = google_storage_bucket.functions.name
  source_archive_object = google_storage_bucket_object.nodejs_functions.name
  entry_point           = "v2"

  trigger_http = true
}

resource "google_cloudfunctions_function_iam_member" "v2invoker" {
  project        = google_cloudfunctions_function.v2.project
  region         = google_cloudfunctions_function.v2.region
  cloud_function = google_cloudfunctions_function.v2.name

  role   = "roles/cloudfunctions.invoker"
  member = "allUsers"
}

output "function-v2" {
  value = google_cloudfunctions_function.v2.https_trigger_url
}

resource "google_cloudfunctions_function" "helloWorld" {
  name                  = "helloWorld"
  runtime               = "nodejs12"
  available_memory_mb   = 128
  source_archive_bucket = google_storage_bucket.functions.name
  source_archive_object = google_storage_bucket_object.nodejs_functions.name
  entry_point           = "helloWorld"

  trigger_http = true
}

# IAM entry so all users can invoke the function
resource "google_cloudfunctions_function_iam_member" "invoker" {
  project        = google_cloudfunctions_function.helloWorld.project
  region         = google_cloudfunctions_function.helloWorld.region
  cloud_function = google_cloudfunctions_function.helloWorld.name

  role   = "roles/cloudfunctions.invoker"
  member = "allUsers"
}

output "function-helloWorld" {
  value = google_cloudfunctions_function.helloWorld.https_trigger_url
}