You probably got out from Darkscape through the Cordon entrance and the mission to free the Duty member didn't triggered because the trigger point is after a couple of meters from the Dark Valley entrance, but don't worry just go back towards that entrance (you don't have to go through) and you will get it.
Also to open the safe you have to rotate that knob. You can rotate it in one direction you lock the number in the opposite, when you lock a number you have to turn the knob in the other direction to rotate the numbers. I don't know if this makes sense but let me know if you need further explanation!
Matthos
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