Properties for glpi-agentmonitor v1.5 for Systray

[double-hotel-42]

Hi all,
currently I am upgrading my clients from GLPI-Agent v1.4 to v1.5 and want to enable the systray feature. For the distribution of the client, I use an agent.msi file that I first customized with Orca and in which I have adapted the following properties:

Property -> ADD_FIREWALL_ECEPTION = 1
Property -> RUNNOW = 1
Property -> SERVER = http://10.xx.xx.xx/glpi/front/inventory.php

Until here everything works fine. According to the official documentation I now need to set the following two to enable systray:

Property -> EXECMODE = 1 (Run as a Windows-Service 1 = always running)
Property -> AGENTMONITOR = 1

As soon as I add EXECMODE = 1 in the properties of my .msi it becomes unuseable in the sense of the installer giving an error when trying to install it. What did I miss in my deployment?