Warrior not priming while I’m party still?

Hi there. I started playing a warrior and I immediately knew I made a mistake. Regardless, we doing this but I have an issue. Alone I am great, leap slam, monsters get primed and bone shatter them away from this plane of existence. I started playing with my friend and I noticed j can’t prime for stun anything. Rarely happens and all I do is leap all over the map hoping something gets primed so I can be useful.

I read on posts about 2 month ago, this was an issue. Do we still have this problem? Any word on fixing this. This is awful, how can the scaling be so bad I can’t play with friends.