DTH 1152 Touch Screen not working with XenApp

The pen on the 1152 only works with XenApp if Windows Ink is disabled in the Wacom Tablet control panel because of a known issue between Citrix and Microsoft.
Due to the nature of XenApp and the way that it works with shared resources, Windows Ink is unable to work on a XenApp host.
By default the Wacom pen attempts to use Windows Ink, which is why it then works in XenApp when the use of Ink is disabled.
For touch the 1152 always uses Windows Ink for one and two finger inputs.
This issue has been reported to Citrix by multiple sources and we know that they are working with Microsoft to resolve it in a future update to XenApp.
At the time of writing (Nov 2018) there is no work-around for this issue - it depends upon Citrix and Microsoft between them to produce a solution in a later release of XenApp and/or Windows.