Odd issues (due to game mechanics)
I had to open a door with 2 keys (one found in location A, and the other found in location B). I have done this mini-dungeon several times already, a part on the main quest line. Only one of each key can be looted for the whole party (validating for the whole party).
Just last time, with a team of 4, my main character had the 2 keys (A and B) in inventory as intended, but I couldn't open the door... Then I noticed that one of my other characters had a copy of key A, probably messingf the whole thing. I had to restart the mini-dungeon.
So, prior to looting such items, I recommend that you turn Broadcasting off (which I didn't)...