Postgres is not getting created in the terraform template

I am getting below error while creating postgres flexible server.


azurerm_kubernetes_cluster.aks_cluster: Still creating... [3m10s elapsed]
azurerm_kubernetes_cluster.aks_cluster: Still creating... [3m20s elapsed]
azurerm_kubernetes_cluster.aks_cluster: Creation complete after 3m23s [id=/subscriptions/f733ab10-e6a2-406d-9c23-cafe4ec0e71e/resourceGroups/testaksk8s-del/providers/Microsoft.ContainerService/managedClusters/testaksk8s-del-cluster]
╷
│ 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: '30efb319-5c47-4705-8a1d-c2afab51ccf9'"
│
│   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" {

my template:



resource "azurerm_private_dns_zone" "example" {
  name                = "example.postgres.database.azure.com"
  resource_group_name = azurerm_resource_group.postgres_rg.name
}

resource "azurerm_private_dns_zone_virtual_network_link" "example" {
  name                  = "${var.vnet}.com"
  private_dns_zone_name = azurerm_private_dns_zone.example.name
  virtual_network_id    = azurerm_virtual_network.aksvnet.id #var.virtual_network_id
  resource_group_name   = azurerm_resource_group.postgres_rg.name
}

resource "azurerm_postgresql_flexible_server" "example" {
  name                   = "${azurerm_resource_group.postgres_rg.name}-${var.environment}"
  resource_group_name    = azurerm_resource_group.postgres_rg.name
  location               = azurerm_resource_group.postgres_rg.location
  version                = "13"
  delegated_subnet_id    = azurerm_subnet.example2.id
  private_dns_zone_id    = azurerm_private_dns_zone.example.id
  administrator_login    = var.administrator_login
  administrator_password = var.administrator_password
  zone                   = "1"

  storage_mb = 131072

  sku_name   = var.postgres_sku #"GP_Standard_D2s_v3"
  depends_on = [azurerm_private_dns_zone_virtual_network_link.example]

}
/*
resource "azurerm_postgresql_database" "example" {
  name                = "mydatabase"
  resource_group_name = azurerm_resource_group.postgres_rg.name
  server_name         = azurerm_postgresql_flexible_server.example.name
  charset             = "UTF8"
  collation           = "English_United States.1252"
  depends_on          = [azurerm_postgresql_flexible_server.example]
}
*/