AVD add App Assure references

Author: dknappettmsft

articles/virtual-desktop/TOC.yml

@@ -678,6 +678,8 @@
     href: https://github.com/Azure/RDS-Templates/tree/master/ARM-wvd-templates
   - name: Terraform samples
     href: /azure/developer/terraform/configure-azure-virtual-desktop
+  - name: App Assure for Azure Virtual Desktop
+    href: /microsoft-365/fasttrack/windows-and-other-services#app-assure
   - name: Azure compliance offerings
     href: https://azure.microsoft.com/resources/microsoft-azure-compliance-offerings/
   - name: Azure Virtual Desktop (classic) documentation

articles/virtual-desktop/troubleshoot-set-up-overview.md

@@ -24,6 +24,10 @@ To report issues or suggest features for Azure Virtual Desktop with Azure Resour
 
 When you make a post asking for help or propose a new feature, make sure you describe your topic in as much detail as possible. Detailed information can help other users answer your question or understand the feature you're proposing a vote for.
 
+## Help with application issues
+
+If you encounter application issues, App Assure is a service from Microsoft designed to help you resolve them at no additional cost. For more information, go to [App Assure](/microsoft-365/fasttrack/windows-and-other-services).
+
 ## Escalation tracks
 
 Before doing anything else, make sure to check the [Azure status page](https://azure.status.microsoft/status) and [Azure Service Health](https://azure.microsoft.com/features/service-health/) to make sure your Azure service is running properly.