Add not-standalone lab restriction to WNG and prepare-to-deploy

Author: rcdun

articles/communications-gateway/prepare-to-deploy.md

@@ -20,6 +20,8 @@ The following sections describe the information you need to collect and the deci
 
 [!INCLUDE [communications-gateway-deployment-prerequisites](includes/communications-gateway-deployment-prerequisites.md)]
 
+if you want to set up a lab deployment, you must have deployed a standard deployment or be about to deploy one. You can't use a lab deployment as a standalone Azure Communications Gateway deployment.
+
 ## Arrange onboarding
 
 You need a Microsoft onboarding team to deploy Azure Communications Gateway. Azure Communications Gateway includes an onboarding program called [Included Benefits](onboarding.md). If you're not eligible for Included Benefits or you require more support, discuss your requirements with your Microsoft sales representative.

articles/communications-gateway/whats-new.md

@@ -22,7 +22,7 @@ From March 2024, you can set up a dedicated lab deployment of Azure Communicatio
 - Test new Azure Communications Gateway features and services (for example, configuring Microsoft Teams Direct Routing or Zoom Phone Cloud Peering).
 - Test changes in your preproduction network, before rolling them out to your production networks.
 
-You plan for, order, and deploy lab deployments in the same way as production deployments.
+You plan for, order, and deploy lab deployments in the same way as production deployments. You must have deployed a standard deployment or be about to deploy one. You can't use a lab deployment as a standalone Azure Communications Gateway deployment.
 
 For more information, see [Lab Azure Communications Gateway overview](lab.md).