Final step involving the forge ignition activity and the forging of the nearly completed frame given by Ada-1 does not complete upon successful completion of the forge activity and the killing of the boss. I've been doing this activity every week with no issue. After two successful attempts at killing the forge boss and completing the activity I have not been able to complete the quest step and receive the completed weapon. It just doesn't acknowledge the completion or give any legendary tier weapon. I did just buy the Upgrade Edition for the game off of Steam and this unlocked a lot of stuff including the [Lock and Key] Mystery Box quest which involves the different forges and collecting the keys. I also have the quest [Black Armory Key Mold], which doesn't directly involve any forge but who knows. Conflicts maybe?