After the weekly reset i still count as completed Prision of Elders and i unable to gain the Loot from this activies this week.
Please Bungie Help!
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https://www.bungie.net/en/Forum/Post/124483220/0/0 Not an official response, but hopefully someone we can trust. I posted his earlier today in the help section. I'll find out if this info is true in about an hour