I think what Dugi is saying that the quest might be bugged, and to contact the GM. I’ve run into issues where the guide says one thing, but I’m unable to do it, because somehow the quest is bugged, through no fault of the guide.
I’m not saying that is what is happening in your case, because I’m not at your quest yet, but often dropping the quest or contacting the GM solves the issue when there is a quest that’s not there.