A few seasons back i accidentally deleted the Exotic Cipher quest from Xur, leading to it now being unobtainable on all characters ever since.
It would be nice to have it tied to the Quest Archives in case it does get deleted so it can be reacquired, or just have Xur sell it again on his next weekly visit.
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Hi there. This is a known issue with the quest not going to the Quests archive when abandoned. The only way to reobtain it on characters that have abandoned it is to get the quest from Xur on a character that hasn't abandoned it and complete it. It then becomes available again on all characters the following week. If you've abandoned it with all 3 characters though, then the only current workaround is to delete and create a new character to pick up the quest.