Bought the DLC and it still shows " Require Destiny 2 :The Final Shape " when I want to progress the campaign after the first mission. Can't find anyone else with this kind of problem and even after a day from writing ticket to support I still can't play for what I payed for. At DLCs management on steam it's marked off and at the shop page for the DLC it says " Already in Steam Library ".
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Have you tried restoring your licenses? https://help.bungie.net/hc/en-us/articles/360049196071-Accessing-and-Restoring-Licenses-to-Destiny-Content (΄◉◞౪◟◉`)