Configuring RDS Server 2012r2 Start Screen not working

I'm in the process of setting up an RDS server. It will be multi-tenant, so it's locked right down. All user profile data is stored on the file server using GPO folder redirection.

I want to lock the start screen right down to only show what they have access to: Office, our application, "This PC", Desktop, Notepad and Calculator.

I have logged as an admin user and configured a start screen to suit. Used Export-StartLayout to get my layout XML. I have set the use start layout GPO to the user share where it is located.

The issue is:

I cant get all the apps to show on the start screen. Office shows fine, but our app wont show along with notepad and "this PC".

A little stuck on this one...

Layout.XML

<launcher version="2"><view name="Start"><group name="Desktop"><tile AppID="{C9BAE21F-221E-405F-BA9D-FAC741829F4F}\Office Companion.lnk" size="square150x150" FencePost="0" /><tile AppID="Chrome" size="square150x150" FencePost="0" /><tile AppID="{1AC14E77-02E7-4E5D-B744-2EB1AE5198B7}\notepad.exe" size="square150x150" FencePost="0" /><tile AppID="Microsoft.Windows.Computer" size="square150x150" FencePost="0" /><tile AppID="Microsoft.Windows.Desktop" size="square150x150" FencePost="0" /></group><group name="Microsoft Office"><tile AppID="{7C5A40EF-A0FB-4BFC-874A-C0F2E0B9FA8E}\Microsoft Office\Office15\ONENOTE.EXE" size="square150x150"  FencePost="0" /><tile AppID="Microsoft.Office.OUTLOOK.EXE.15" size="square150x150" FencePost="0" /><tile AppID="{7C5A40EF-A0FB-4BFC-874A-C0F2E0B9FA8E}\Microsoft Office\Office15\WINWORD.EXE" size="square150x150"
      FencePost="0" /><tile AppID="{7C5A40EF-A0FB-4BFC-874A-C0F2E0B9FA8E}\Microsoft Office\Office15\EXCEL.EXE" size="square150x150"
      FencePost="0" /></group></view></launcher>