Bound Presence is supposed to drop from your first completed Containment each week, however this is the third week in a row that it has failed to drop for my Warlock. Additional runs of Containment also fail to drop a Bound Presence, as I did close to 20ish runs last week before giving up without a drop. A current work around can be achieved by swapping to another class and running Containment, however a bug is a bug and I didn't see it in the "Known Issues" pinned post.