Forging Trust

Forging Trust is a main quest

Detailed walkthrough
The quest starts automatically upon entering the vicinity of Fort Atlas. The first objective is to speak with Russell Dorsey, who is standing near a tent. After asking him about speaking with the Brotherhood leaders, he freely admits that he is the wrong person to speak to and hints towards Knight Shin, who is located inside the fort's interior.

After entering the interior through the double doors, the Vault Dweller is witnessing the conversation between Paladin Rahmani and Knight Shin, during which she tasks him with taking care of the civilian petitioners.

The next objective is to talk with Shin. Telling him about Dorsey results in Shin asking if the Vault Dweller wants to join the Brotherhood, to which there a several replies (Yes, Maybe, Lie or a Charisma +4 speech check). Regardless of the choice, the next test is about following orders. One is then tasked with speaking to the four civilian petitioners that are present in the interior. Shawn is complaining about Brotherhood personnel confiscating his belongings, Art wants to trade surplus produce of his farm for protection against raiders, Doc Blackburn is looking for supplies that are hard to come by and Tally wants to aquire some "big shiny guns".

Upon returning to Shin and telling him about each petitioner's inquiry, it becomes clear that he has no intention to deal with any of them, no matter what answers are chosen. He then congratulates for passing the test and promises to mention it in his report to Paladin Rahmani, though he advises to "lose those soft, civilian instincts" for the future.

His final advice is to look for Scribe Valdez further ahead inside the building. Activating the scanner will give access past the laser grid, conclude the quest and automatically start Mother of Invention.