Update deployment documentation with security notes

Added note about security restrictions and WAF-supported version deployment.

Author: Thanusree-Microsoft

docs/DEPLOYMENT.md

@@ -16,6 +16,8 @@ Check the [Azure Products by Region](https://azure.microsoft.com/en-us/explore/g
 
 Here are some example regions where the services are available: East US, East US2, Australia East, UK South, France Central.
 
+> **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](./docs/AZD_DEPLOYMENT.md#3-choose-deployment-configuration).
+
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