Add known issues

Author: ntrogh

articles/lab-services/how-to-create-manage-template.md

@@ -60,6 +60,10 @@ In this step, you publish the template VM. When you publish the template VM, Azu
 
     ![Virtual machines in stopped state](./media/how-to-create-manage-template/virtual-machines-stopped.png)
 
+## Known issues
+
+When you create a new lab based on an exported lab VM image from an Azure compute gallery, you’re unable to login with the credentials you used for creating the lab. Follow these steps to [troubleshoot the login problem](./troubleshoot-access-lab-vm.md#unable-to-login-with-the-credentials-you-used-for-creating-the-lab).
+
 ## Next steps
 
 See the following articles: