Doing the seasonal journey just for fun.
I have done 2 conquests (3 leg gems to 70 and the 2 minutes T10 rift).
When I check (Shift + J), I only see 0/3.
I need to do the third conquest to see 3/3?
Sorry for my English.
Not sure; but if you have unlocked the steps where season journey is needed it obviously counts.
Like, if you at Guardian now it counted.
My D3 armory
My Youtube Channel
You can also see the current seasons completed conquests in the achievements panel under the season tab.