Is there any special condition to getting the doors to the loot room open? I've had it happen twice now where I make it to the loot room and the door won't open. Both times were on capture missions. Anyone else have this problem? I mean the big door after getting past the big fan hall.
You have to have the right key for the right door. If you go in with one key, and you don't get the door that needs that key, it won't open. The best way to do it is to go in with 4 people, each with one of the keys. That way, no matter which door shows up, you can get in.
No, the OP is not talking about Vaults. No, you do not need a vault key to open the parkour loot room. Yes, you need to hit the pressure plate to activate the door timer. The pressure plate in located up in the middle of the room. No, you only get one try. No, there is nothing worthwhile in the loot room.