Hi there. Delete the quest then reacquire it from The Drifter or the Spider.
English
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Tried this, did not work.
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@BNGHelp6 I had the same issue, I completed the Siren Song, timer to end the adventure expired and nothing happened - seemed like the mission was not over. I tried going to orbit, deleting the quest and reacquiring from the drifter and I'm still stuck at that step but the heroic adventure no longer appears on Titan.