Hey there. Is Mara not present in your own instance? If not, I have an idea where the quest might be at. In Mara's throne room, there's a set of steps leading down to a small room below it. There's meant to be a meeting between Mara and Osiris here, people miss the steps and think the quest is bugged, then abandon the quest and can't proceed. If that sounds familiar, the conversation will still play down in that room, even without the quest in your log. After that, go back to orbit and re-enter HELM, Mara should be on her throne and should have the quest.