The door to the Pilot Lounge in Prey, which is located in the Shuttle Bay section of Talos I, has a randomly generated keycode, meaning it is different for everyone in every playthrough. However, where to find the keycode is the same every time.
The code for the door to the Pilot's Lounge can be found by searching the body of Octavia Figgs, who can be found in the Staff Lounge of the Talos I Lobby. Her body is behind the kitchen counter. Search it and listen to the Transcribe to get the door keycode.