weird loot issue

So, my I had my original account. Saw some guy multiboxing and said hey thats cool. Bought 2 more copies to triple box. started the free trial from isboxer. Followed the quick setup video to a T. everything works just fine except my third guy is not able to share loot with the other 2 ever. It's weird. When i drop gear on the guy that can't share the other 2 cant see the loot on the ground. when the other 2 drop gear its grayed out and says this item belongs to someone else. Any ideas?
i can share loot between my first and second account but not between my first and third or second and third.

[MiRai]

My guess would be that that account has the restrictions that some new accounts normally see. As the page states, it may take up to 72 hours for the restrictions to be lifted.