Keycard is bugged af for some reason, hook won't detect it even if you already grabbed it and left it elsewhere. Only solution I could think of is going into Sandbox, picking up the keycard by deleting the door and then changing the name of the save so it becomes a Story mode save and transferring it with mailbox
Viewing post in Voices of the Void 0.9.0 feedback
I found someone online who used a chair glitch to pass through the first bunker door. I tried it myself as I also couldn't hook the keycard for the life of me, and after a little fiddling it worked like a charm!
/t/6185467/cant-hook-an-key-card-from-bunker-alpha