[AzureAD] Fixes MicrosoftDocs/azure-docs#50860

Author: iainfoulds

articles/virtual-machines/linux/login-using-aad.md

@@ -53,6 +53,8 @@ The following Azure regions are currently supported during the preview of this f
 
 >[!IMPORTANT]
 > To use this preview feature, only deploy a supported Linux distro and in a supported Azure region. The feature is not supported in Azure Government or sovereign clouds.
+>
+> It's not supported to use this extension on Azure Kubernetes Service clusters. For more information, see [Support policies for Azure Kubernetes Service](../../aks/support-policies.md).
 
 
 If you choose to install and use the CLI locally, this tutorial requires that you are running the Azure CLI version 2.0.31 or later. Run `az --version` to find the version. If you need to install or upgrade, see [Install Azure CLI]( /cli/azure/install-azure-cli).