Merge pull request #279438 from amjadaljunaidi/patch-13

Update app-routing-dns-ssl.md

Author: prmerger-automator[bot]

articles/aks/app-routing-dns-ssl.md

@@ -27,6 +27,7 @@ The application routing add-on with nginx delivers the following:
 - Azure Key Vault if you want to configure SSL termination and store certificates in the vault hosted in Azure.
 - Azure DNS if you want to configure global and private zone management and host them in Azure.
 - To attach an Azure Key Vault or Azure DNS Zone, you need the [Owner][rbac-owner], [Azure account administrator][rbac-classic], or [Azure co-administrator][rbac-classic] role on your Azure subscription.
+- All public DNS Zones must be in the same subscription and Resource Group.
 
 ## Connect to your AKS cluster