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Returned when the requested crew member or vessel isn’t on one of your attached vessels — or doesn’t exist. The two are deliberately indistinguishable so you cannot enumerate the CrewPass user base.
Fix
  • Confirm the vessel is attached to you (vessels/lookup returns attached).
  • Confirm the crew member appears in your GET /fleet results.
  • A crew member who genuinely exists but sits outside your fleet will always return 404, never 403.