|I pretty much agree with all those above. Frankly, I don't believe the AIF should be put into a position where they're asked to sign the principal's name for them when a jurat applies, but that's outside of our control, as Yoli explained. However, if a jurat is clearly requested (and confirmed by hiring party), we need to remember that it's the person who *does* "personally appear" in front of us who is taking the oath and swearing/affirming to the truthfulness of the document. And it's their name alone that goes on our certificate (in CA, at least).
If an AIF doesn't know if the document is true or doesn't feel comfortable stating so, I wouldn't complete the notarization. [It's been a long time, but I've run into that before, at least once. As I recall, the client understood and we sent that document back unsigned.]
The most likely place to find that situation would be with a Signature/Name Affidavit. And, of course, the AIF can't provide alternate signatures for someone else, either.