How do I add contacts on BBM? , It's not working (HELP)?

K so i try to add my friends pin and scan there bar code but it says : Pending(Waiting for Authorization). But on their blackberry , no friend request comes up. I also tried deleting that request and have them add me but that also didn't work ? I have also tried doing this same process with different people but it still hasn't worked ,does anybody know what i have to do?