From GameWatcher: “The iconic Fallout faction the Brotherhood of Steel returns in the latest game in the series Fallout 76, but how do you find and complete the Fallout 76 Brotherhood of Steel quest and join the faction itself?
We’ll show you. Be warned, you’ll have to be at least level 20, since you’ll be venturing far to the north-east of the Mire region, which is no walk in the park – in fact it’s one of the hardest areas in Fallout 76. Still, if you want to join the Brotherhood of Steel, this is how to do it.”
Source: N4G PC Fallout 76 Brotherhood of Steel Quest – How to Complete