Custom RDP Settings on Server 2012 VDI

Hi All,

I'm trying to add a custom RDP setting to our Server 2012 RDS Collection. I want to remove the connection bar so users can't just close out by clicking the X, which seems to lock up a RD session in a "Disconnected" state and force them to use the regular OS logoff. I try to enter the command:

Set-RDVirtualDesktopCollectionConfiguration -CollectionName NAME -CustomRdpProperty "displayconnectionbar:i:0"

I get an error: "A Remote Desktop Services does not exist on ..."

I found where the reg setting is under HKLM\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Terminal Server\CentralPublishedResources\PublishedFarms\COLLECTIONNAME\DeploymentSettings. If I try to just manually add that custom setting there, when a client tries to launch the RDP setting from the RDWeb, it says that the RDP file is corrupted.

Any ideas on what I need to do? 

Thanks!!