Best posts made by mrendler
@dargodargo38 Go to Dover Fortress and go the middle building close to where the ability point is. Use Odin vision until you find a man who shows up blue, assassinate him and the quest will be able to continue. It worked for me.
@jjbakes87 I can confirm that I tried this method and it worked for me as well. I didn't get any indication on how to proceed with the quest, went to Dover fortress to try what you posted, and after I assassinated him I was able to progress with the quest.