Hi,
To get an argument from a process, the process has to be run from the App first. Have you added a “start process” activity somewhere to start your Orchestrator Process?
If not, then maybe add one on the loading of the page, by clicking Edit Rule on the Events tab at the Dashboard level(right hand side of the page). (Change this later to some other UI event if needed later)
Then add a Start Process activity and point to your Orchestrator Process.
This will start your Orchestrator process, and the out_argument returned from your process will set the value in your UI elements
Thanks,
Nishant