Seems like there is one instruction it didn't follow: The first task mentions the usernames should be exactly like in the list, yet the AI responds with "firebob" (as in the comment) rather than "FireBob1990" (as in the list)
Funnily enough, that is exactly the kind of thing a human might do, as we too are terrible at following instructions precisely.
Yes, I noticed this after I posted. Small errors like this become common when instructions reach this length. It randomly forgets to do steps that aren’t written down — it never leaves things blank, but it forgets pieces of compound directions.
I also suspect it was confused by the fact the name was abbreviated but not misspelled, and it was only told explicitly to ensure names are not misspelled. Still an error though.
Funnily enough, that is exactly the kind of thing a human might do, as we too are terrible at following instructions precisely.