You can continue to use recall knowledge for more information.
"Identifying monster abilities is one of the most common
uses of Recall Knowledge. The monster’s commonality
sets the difficulty: low for common monsters, high for
uncommon, and severe for rare or unique. Most monsters’
level should be the level of the DC, but you could reduce
the level drastically for really famous monsters. A
character who succeeds identifies the monster and singles
out one of its best-known attributes—such as a troll’s
weakness to acid and fire or a manticore’s tail spikes. On
a critical success, the character gets that information plus
something more subtle, like a demon’s weakness or the
trigger for a reaction.
After a success, further uses of Recall Knowledge can
yield more information, but you should increase the
difficulty each time. Once a character has attempted
an extreme-difficulty check or failed a check, further
attempts are fruitless." -Page 338 of the playtest rulebook
it's not one and done pass or fail like in 1E