First make sure by checking the interface and optimization stats. They'll confirm if optimization is indeed running.
run from the cli:
wanos-show bypass0.active
If it says 'false', then the peer is actually up, even though you see nothing in the GUI (I'll investigate and see if I can reproduce the blank status)
If not, the most likely causes:
Traffic is not flowing through the device in both directions
lan0 - wan0 are reversed on one of the sides
bypass rule is in place that's passing traffic through
Test protocol is in the default bypass list e.g. 443