Hi,
Sorry didn't see your answer !
Yes, the HUB is showing installed.
The only thing/difference we managed to investigate is that when Omnissa released the multiuser capability, then our workflow stops working without user session opened. We didn't manage to find anything on the logs, neither on console.
So we think it relies on the new feature but we don't know if it's a feature or bug
For now we are opening the staging user session for the workflow to work