Error: 403 Forbidden with Terraform

Hi,
we where successfully using Terraform to manage our Auth0 settings. Lately we switched from a pain plan to the free plan and when running terraform plan we are now getting this error:

│ Error: 403 Forbidden: The account is not allowed to perform this operation, please contact our support team
│
│   with module.auth0.auth0_custom_domain.auth,
│   on ../modules/auth0/main.tf line 52, in resource "auth0_custom_domain" "auth":
│   52: resource "auth0_custom_domain" "auth" {

That makes completely sense since the free plan does not allow custom domains.

The problem is that even removing this block we are now getting this error:

Error: 403 Forbidden: The account is not allowed to perform this operation, please contact our support team

With no indication about the offending block. Just wondering if Terraform is allowed on the free plan or is completely forbidden. Any help?

Best,
Luigi