Authenticate from azure ad to Azure postgreSQL from terraform pipeline

I enabled Azure AD authentication on a Azure postgreSQL database with this code:

data "azurerm_client_config" "current" {}

resource "azurerm_postgresql_active_directory_administrator" "aadauth" {
  server_name         =
  resource_group_name =
  login               = "aad-admin"
  tenant_id           = var.globals.tenant_id
  object_id = data.azurerm_client_config.current.object_id

So that would mean that i can acces the database from the terraform pipeline because the azure subscription SPN that the pipeline runs under has acces to the database. But when i try to create a read only role in the DB i get this error:

Error: error detecting capabilities: error PostgreSQL version: dial tcp [::1]:5432: connect: connection refused

But the firewall is open and i’am able to connect with the normal provider with username and pass

I also tried to add the provider for aad auth without a pass (not sure if this is possible):
provider “postgresql” {
alias = “testdb”
host = “
username = “aad_admin@testdb”
database_username = “aad_admin”
superuser = false

Error: error detecting capabilities: error PostgreSQL version: pq: empty password returned by client

I’am running this under the latest version of the “cyrilgdn/postgresql” provider by the way

Would be great if someone can help me out here.
Kind regards, Marco