Spent a long time yesterday completing the raid. Claimed the triumph, and clicked "Email discount code" and went to sleep. Got around to my emails this afternoon and it asks me to click a link to get the code, which then says "This bungie reward is no longer available" - what!? I claimed the triumph and clicked email 16 hours before reset, not knowing there was an extra step and now I am locked out of this?
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Unfortunately yes, the code had to be claimed before reset.