private_ip_address_allocation unusable in azurerm_virtual_network_gateway ip_configuration block

[CMBG-Jamie]

I've tried but to no avail to use a static IP configuration for the internal IP of a VPN Gateway. I've tried the usual ip_address, private_ip_address, static_ip_address, internal_ip_address parameters to accompany a private_ip_allocation_method of "Static" but I can't even validate the document.

Is this feature even available yet, or is there some parameter which is missing from the documentation?

[ljluestc]

provider "azurerm" {
  features {}
}

# Resource Group
resource "azurerm_resource_group" "example" {
  name     = "rg-vpngateway"
  location = "East US"
}

# Virtual Network
resource "azurerm_virtual_network" "example" {
  name                = "vnet-example"
  address_space       = ["10.0.0.0/16"]
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
}

# Subnet for Gateway (Ensure it’s named "GatewaySubnet")
resource "azurerm_subnet" "gateway_subnet" {
  name                 = "GatewaySubnet"
  resource_group_name  = azurerm_resource_group.example.name
  virtual_network_name = azurerm_virtual_network.example.name
  address_prefixes     = ["10.0.255.0/27"]
}

# Public IP for the VPN Gateway
resource "azurerm_public_ip" "vpn_gateway_ip" {
  name                = "vpnGatewayPip"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  allocation_method   = "Static"
}

# VPN Gateway
resource "azurerm_virtual_network_gateway" "vpn_gateway" {
  name                = "example-vpn-gateway"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name

  type     = "Vpn"
  vpn_type = "RouteBased"

  active_active = false
  enable_bgp    = false

  sku = "VpnGw1"

  ip_configuration {
    name                          = "vnetGatewayConfig"
    public_ip_address_id          = azurerm_public_ip.vpn_gateway_ip.id
    subnet_id                     = azurerm_subnet.gateway_subnet.id
    private_ip_address_allocation = "Dynamic"  # Static assignment not supported here
  }

  tags = {
    environment = "test"
  }
}