I have the same issue. I went out on the plains at night and had no waypoint. all 3 parts built. I spoke to Nakak and selected the "Mask?" option when I spoke to him. He went through the details about the mask and I'm still stuck.
So, I don't know if anyone's solved this yet, but I've been having the same issue as everyone else and I couldn't find a solution anywhere. After several different attempts, including trying to get a new Revenant systems blueprint and craft it, nothing worked. On a whim I wnet back to my ship and checked my quest log... the quest DID NOT show up in the quest log, but I searched for it "Mask of the Revenant" in quest search menu and it popped up. Activating the quest updated everything for me and allowed me to progress.
Dunno if this will help anyone else, but it worked for me and I hope it works for the rest of you.
after you found it,touch it, if u are unable to do so, go to cetus and do a bounty which has a revenant component as a reward,do the bounty after the bounty is complete wait for night and go to the plains.a