Added troubleshooting items

Author: dknappettmsft

articles/virtual-desktop/troubleshoot-custom-image-templates.md

@@ -47,3 +47,17 @@ If you receive the error message starting **PrivateLinkService Network Policy is
 ## Removing the Microsoft Store app 
 
 Removing or uninstalling the Microsoft Store app is not supported. Learn how to [Configure access to the Microsoft Store](/windows/configuration/stop-employees-from-using-microsoft-store).
+
+## Issues installing or enabling additional languages on Windows 10 images
+
+Additional languages can be added by custom image templates, which uses the [Install-Language PowerShell cmdlet](/powershell/module/languagepackmanagement/install-language). If you have issues installing or enabling additional languages on Windows 10 Enterprise and Windows 10 Enterprise multi-session images, ensure that:
+
+- You haven't disabled installing language packs by group policy on your image. The policy setting can be found at the following locations:
+   - Computer Configuration > Administrative Templates > Control Panel > Regional and Language Options > Restrict Language Pack and Language Feature Installation
+   - User Configuration > Administrative Templates > Control Panel > Regional and Language Options > Restrict Language Pack and Language Feature Installation
+
+- Your session hosts can connect to Windows Update to download languages and latest cumulative updates. 
+
+## Is Trusted Launch or are Confidential VMs supported?
+
+As custom image templates is based on Azure Image Builder, support for Trusted Launch or Confidential VMs is inherited. For more information, see [Confidential VM and Trusted Launch support](../virtual-machines/image-builder-overview.md#confidential-vm-and-trusted-launch-support).