I just completed "The Promethean Code" mission as part of the weekly story playlist. This was my first mission of the week and I did not receive the Treasure of Ages drop. My inventory was not full, I do not have any treasures left over on any character from previous weeks, it did not go to the postmaster or anything along those lines. Oddly enough, I received 35 marks from the completion as opposed to the normal 20. My marks have not been close to maxed out all week, so I don't think it's anything along those lines, but it is interesting that that happened and I did not receive the treasure. Maybe the extra mark drop ate the ToA drop?
Has anyone else experienced something like this?
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There was a bug that if you didn't open a treasure from the previous week before Tuesday reset; then you would not be able to earn that treasure the next week. This was fixed in the 4/20 hotfix, but is probably what hit you here. Sidenote, the 15 marks for the daily appear to be rewarded for completing the heroic weekly story missions as well (20 + 15 = 35). They don't have to be coincidentally the same mission either.
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Weekly story playlist: was implemented with AoT Daily heroic mission: was removed from the director but are still active in the background which rewarded 15 LMs. It seems that these two activities overlapped so you received 15 from the daily and 20 from the story playlist. So in turn it disabled the AoT reward.
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Is it still listed as a reward? Try running another story mission from the playlist.