Yesterday and today I have only had two zereth mortis dailies. I have unlocked the third by completing the prerequisite puzzle quests. I then turned and asked my friends and my brother, but they have no idea why I am missing one daily. This daily is critical because I am now falling even further behind as a returning player.
Maybe I am doing something wrong, I dunno, but I assume this is a technical issue considering I literally cannot find anything related about the restriction to two dailies after completing the puzzle prerequisites anywhere.