What kind of information is typically valuable to you in trying to find out why MWB would block a connection unwarranted? I would say the fastest method of debugging in this case would be to actually download the game, I'll manually pump up the account to give you access to multiplayer, and you would queue for a match and see if MWB is doing anything off-kilter at that point. However, I wouldn't want to ask that level of work on your end if it's not necessary. Please let me know if there's anything I can provide you from our standpoint, we'd love to take care of this for our users.