Poisoning the Food Supply in Blood River Outpost

I'm at the point in the quest line where I'm supposed to poison the vigilante's food supply, but when I go to their food area, even though I have the poison in my inventory, nothing I do seems to allow me to do it. I've tried picking up the food to see if I can poison it and then put it back, but it just has me steal it and it doesn't go back. Another thread says that it just comes up as an option, but I've tried it and nothing happens. A couple of other people have been around me, stating the exact same problem as well, and no one knows how to solve it.

 

stupid question: are you viewing nameplates?

 

Are you sure you found the "right" spot for poisoning?

You should be able to start a conversation with the "right" spot....

 

I have the same problem, seems like the real quest is not solving the quest but hot to do the game mechanic "food poisoning".
I hate it when games make the solving of puzzles hard not by making an hard puzzle but by making it hard to figure out the mechanic of how to do something.

 

it's not you, it's broken.