In the house with Tannis and the Safe in Sanctuary (the Crimson Raider hideout) there’s a red Dahl branded chest behind a gate. There’s a green-lit switch to the left of the door but pulling it doesn’t work. Later on in the story the switch turns red and won’t turn, I still can’t get into the gate.
How do I open the gate and get to that chest?
You will gain access to the room after completing the main storyline quest Where Angels Fear to Tread (Part 2). You only get to loot the chest once, however.