Merge pull request #252919 from aimee-littleton/patch-166

Update tutorial-hub-spoke-nat-firewall.md

Author: prmerger-automator[bot]

articles/nat-gateway/tutorial-hub-spoke-nat-firewall.md

@@ -20,6 +20,9 @@ NAT gateway can be integrated with Azure Firewall by configuring NAT gateway dir
 
 :::image type="content" source="./media/tutorial-hub-spoke-nat-firewall/resources-diagram.png" alt-text="Diagram of Azure resources created in tutorial." lightbox="./media/tutorial-hub-spoke-nat-firewall/resources-diagram.png":::
 
+>[!NOTE]
+>Azure NAT Gateway is not currently supported in secured virtual hub network (vWAN) architectures. You must deploy using a hub virtual network architecture as described in this tutorial. For more information about Azure Firewall architecture options, see [What are the Azure Firewall Manager architecture options?](/azure/firewall-manager/vhubs-and-vnets).
+
 In this tutorial, you learn how to:
 
 > [!div class="checklist"]