Hello Hari, I am Henry and I want to help you with your issue
My recommendation fix is to re-register these applications for all users.
Run the following command in an elevated PowerShell prompt on the affected RDS server:
Get-AppxPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
After the command completes, log in with a new test user to confirm the Start Menu and taskbar are now working. This command fixes the template for new profiles; it may not fix existing broken profiles.
I hope it can help you.