You can't fail the test. As for power armor, there is a bug with some sort of targeting thing you can put on power armor. It turns others hostile.
After completing the Human Error quest and acquiring Covenant as a settlement, all of the items and beds inside will still be marked as owned, making all settlers immediately hostile if anything is taken. This happens regardless of which path is taken in the quest.
The entire settlement as a whole is hostile to you because you only recently ed the initial occupants. So every settler that gets assigned to the settlement will be hostile to you as well, due to faction ID.
Talia is a craftswoman, making tools and weapons for Penny Fitzgerald. She acts kind and compassionate towards others but has a deep fear of synths. It is implied that she lost her family to synths, like many other members of Covenant.
She will become hostile towards the Sole Survivor if they sided against the Compound during the quest Human Error. If she becomes an allied settler by siding with the Compound, she can neither be traded with, nor assigned to settlement tasks.
If you ``'' up the quest in covenant and they turned hostile to you, you can still fix covenant to make it belong to you. You need to everyone except deezer and the cat, that includes the turrets since the existing ones dont count towards your defense once youre done with everything.
During the quest Human Error, if one decides to rescue Amelia Stockton, Swanson and the rest of Covenant will become hostile towards the Sole Survivor. Following Stockton's liberation, if not killed at Covenant, he may appear in a random encounter and attempt to assassinate the Sole Survivor.
Covenant is an impressively defended and seemingly prosperous community of settlers. The people are friendly, the amenities are quaint, and it appears to be safe. All you have to do is pass a simple test to enter. Many of the settlers at this location have keys to their own houses and the office establishments.
Inside Covenant, players can find a few things that raise suspicions, like an abandoned bed roll, a note that talks about the rules of Covenant and how not to talk about Synths, and self-help books. Yet, none of this leads to concrete evidence of the fate of the caravan's survivors, or Covenant's involvement.
Inspecting Amelia's body after death reveals a synth component on her corpse, meaning that she was indeed a synth.