Prerequisite: Advance your relationship with Lexi by talking to her whenever you can. This will automatically trigger the next time you land on the Nexus.
Upon docking to the Nexus, you’ll get a message from Suvi that Lexi has stepped out of the ship. You have to find her somewhere in the Nexus. She’s located in the Vortex, in the booth beside where Liam is standing. Talk to her to complete the task.