Deception items state they grant a bonus to any attack that "counts a sneak attack".
But what counts as a sneak attack exactly?
For example, let us say you attack a mob who is attacking another party member. Normally, this would be a sneak attack and the deception bonus to hit/damage would kick in.
However, let us say the mob has fortification and it blocks the sneak attack damage. Does that still count as a sneak attack for the deception bonus, just that it does no sneak attack damage?
What if the mob has sneak attack immunity, do you get the deception bonus?