Update Deployment Guide

Added note about security restrictions impacting deployment.

Author: Thanusree-Microsoft

docs/DeploymentGuide.md

@@ -6,6 +6,8 @@ This guide walks you through deploying the Modernize Your Code Solution Accelera
 
 🆘 **Need Help?** If you encounter any issues during deployment, check our [Troubleshooting Guide](./TroubleShootingSteps.md) for solutions to common problems.
 
+> **Note**: Some tenants may have additional security restrictions that run periodically and could impact the application (e.g., blocking public network access). If you experience issues or the application stops working, check if these restrictions are the cause. In such cases, consider deploying the WAF-supported version to ensure compliance. To configure, [Click here](#31-choose-deployment-type-optional).
+
 ## Step 1: Prerequisites & Setup
 
 ### 1.1 Azure Account Requirements