Guild Wars 2

If you created a new character since the feature patch and are working on unlocking traits via game play you will not unlock traits via the personal story steps if you are assisting another player and choose to accept their choices. in order to receive the traits you must be the one to open the instance.
I was unlucky and didnt notice this until i had gone through 80% of the story and was wondering why i wasnt getting any of the traits from it.

Confirmed.

I was leading a story mission run with my guildy, I unlocked traits for ‘battle for claw island’ and ‘light in the darkness’, she did not.