So i just ran the PFS scenario 9-21, In The Grandmasters Name. While this question came up specifically while running it, it is a general question for future DMing as well.
In the scenario it states "To convince Emilio that they are agents of Grandmaster Torch, the PCs must succeed at at least two of the following checks: a DC 19 Disguise check, a DC 19 Bluff check, or a DC 11 Linguistics check to present forged identification documents".
For me this implies that the PCs need to forge these documents if they want to succeed at the linguistics check beforehand or hidden away from Emilio's eyes. A player of mine (our main DM) said that the wording implies that the checks can all be attempted, since there is no word of any prerequisites for it.
What is your take on it? This would be the deciding factor between 1 and 2 prestige points