Cloudflare_zone error "Partial zone signup not allowed"

Terraform
1

I’m trying to automate the creation of dns zones for cloudflare domains.

Here is the code:

terraform {
  required_providers {
    cloudflare = {
      source = "cloudflare/cloudflare"
      version = "~> 3.0"
    }
  }
}

provider "cloudflare" {
  email   = var.cloudflare_email
  api_key = var.cloudflare_api_key
  account_id = "xxxxxxxxxxxxxxxxxxxxxxx"
}

resource "cloudflare_zone" "new-domain" {
    zone = "emanuelcloud.tk"
    plan = "free"
    type = "partial"
}

I get this error, any ideas?

cloudflare_zone.new-domain: Creating...
╷
│ Error: error creating zone "emanuelcloud.tk": Partial zone signup not allowed (1104)
│ 
│   with cloudflare_zone.new-domain,
│   on main.tf line 16, in resource "cloudflare_zone" "new-domain":
│   16: resource "cloudflare_zone" "new-domain" {
│ 
╵

Regards,