I am sorry for the late reply, I was sick and out of country for a while.
I did as you suggested and setup one of the Aruba's devices as an Air Monitor.
To go really basic here, I created a hotspot on my mobile phone with the same SSID, and after deauthenticating (from Kali Linux) OR just plain restarting the wifi interface, it joined my mobile phone's wifi interface.
It stayed there for more than 1 hour!
Shouldn't it be deauthenticating it from my phone's hotspot!? Why aren't these basic IPS functions working, as they are written on the specs sheet?
I have all of the IDS/IPS functionality enabled and an one of the devices is functioning as an Air monitor...