I didn't have this problem myself, but one of my linkshell members did a volume 2 fight, and then was unable to get any of the RoE quests under "content".
Also today I had a /tell from a BST, and they said that while they did a run earlier, they were unable to reacquire volume 2 because the RoE quest didn't show, but they had the quest for volume 1.
Is there a step some are missing? Or is this a known problem?