F5 VE lab setup question - Load balancer not responding to VIP?

It seemly I completely missed the fact the device was working offline. Since it's first time setting this up, thought that's norm. for the virtual environment :) learnt that traffic management won't work when the device is not active, even though you can access the GUI, ping and all

Trying to figure out why the device was inactive, it was show the 'HA status' as down. I wasn't sure how to bring that up so rebooted the device and the HA status became 'Active' again. Seems it synced with the 'device_trust_group'.. which I am not really sure what that's referring to: