This is a very late answer, but I just stumbled on your post, and can’t leave it unanswered.
In order for it to work in multiplayer you have to replicate pawn rotation information to other clients, AI controllers exist only on your Server, and setting focal point won’t automatically replicate this information to other client pawns.
On of the way to fix it would be to to take your resulted pitch and yaw data on the server and manually replicate it to your pawns.