I'm having the same issues on the PC. I've completed Andraknor's requests, and spoke to him after I returned to the Nexus, but it still says I need to speak to Andraknor, again.
Same issue, when I first tried to hand it in there was a companion sign over the quest giver head rather than a quest sign. Saved and reloaded the game and it's now a quest sign but can't talk to him.
Have the same issue on Xbone. Already spoke to Andraknor, now I have the option to interact, but nothing happens and it still says I need to. Ugh.
April 2017 - last edited April 2017
Having the same issue. Talked to him but the quest stays active and the guy is still there. I'm still prompted to talk to him but nothing happens when I do.