Added more info

Author: davidbel

articles/virtual-desktop/authentication.md

@@ -18,7 +18,7 @@ In this article, we'll give you a brief overview of what kinds of identities and
 Azure Virtual Desktop supports different types of identities depending on which configuration you choose. This section explains which identities you can use for each configuration.
 
 >[!IMPORTANT]
->Azure Virtual Desktop doesn't support signing in to Azure AD with one user account and signing in to Windows with a separate user account.
+>Azure Virtual Desktop doesn't support signing in to Azure AD with one user account and signing in to Windows with a separate user account. Doing so can lead to users reconnecting to the wrong session host, incorrect or missing information in the Azure Portal and errors when using MSIX app attach.
 
 ### On-premises identity