The Volunteer Quarters in the Neuromod Division has a randomly generated Keycode, meaning it is different for everyone in every Prey playthrough. However, where to find the keycode is the same every time.
The Volunteer Quarters door code can be found by searching Bianca Goodwin's emails in the Talos I Lobby Executive Suites. It's the first office on the right as you approach Morgan Yu's Office.
Prey (2017) Volunteer Quarters Door Code - GameRevolutionWATCH GALLERY