Unable to create postgres database in azure

With azure cli command.

az postgres flexible-server create --resource-group testaksk8s-del --name testaksk8s-del-dev --subnet /subscriptions/f733ab10-e6a2-406d-9c23-cafe4ec0e71e/resourceGroups/testaksk8s-del/providers/Microsoft.Network/virtualNetworks/testaksk8s/subnets/testaksk8s-subnet2 --private-dns-zone /subscriptions/f733ab10-e6a2-406d-9c23-cafe4ec0e71e/resourceGroups/testaksk8s-del-postgres/providers/Microsoft.Network/privateDnsZones/testaksk8s-del-postgres-del.private.postgres.database.azure.com

I am able to create postgres flexible server.

But with below terraform template

resource "azurerm_postgresql_flexible_server" "example" {
  name                   = "testaksk8s-del-dev"
  resource_group_name    = "testaksk8s-del"
  location               = "eastus2"
  version                = "13"
  delegated_subnet_id    = "/subscriptions/f733ab10-e6a2-406d-9c23-cafe4ec0e71e/resourceGroups/testaksk8s-del/providers/Microsoft.Network/virtualNetworks/testaksk8s/subnets/testaksk8s-subnet2"
  private_dns_zone_id    = "/subscriptions/f733ab10-e6a2-406d-9c23-cafe4ec0e71e/resourceGroups/testaksk8s-del-postgres/providers/Microsoft.Network/privateDnsZones/testaksk8s-del-postgres-del.private.postgres.database.azure.com"
  administrator_login    = var.administrator_login
  administrator_password = var.administrator_password
  zone                   = "1"

  storage_mb = 131072

  sku_name   = var.postgres_sku #"GP_Standard_D2s_v3"
  
}

I am getting error as below.

azurerm_kubernetes_cluster.aks_cluster: Creation complete after 3m59s [id=/subscriptions/f733ab10-e6a2-406d-9c23-cafe4ec0e71e/resourceGroups/testaksk8s-del/providers/Microsoft.ContainerService/managedClusters/testaksk8s-del-cluster]
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    │ Error: waiting for creation of the Postgresql Flexible Server "testaksk8s-del-postgres-del" (Resource Group "testaksk8s-del-postgres"): Code="InternalServerError" Message="An unexpected error occured while processing the request. Tracking ID: '909ed65d-cacb-4f2e-b3f2-ddc743bf8429'"
    │
    │   with azurerm_postgresql_flexible_server.example,
    │   on 12-postgres.tf line 15, in resource "azurerm_postgresql_flexible_server" "example":
    │   15: resource "azurerm_postgresql_flexible_server" "example" {
    │

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