Make sure you're on the purchasing account, then if you're on console go through [url=https://help.bungie.net/hc/en-us/articles/360049196071-Accessing-and-Restoring-Licenses-to-Destiny-Content]restoring licenses[/url]. If you're on Steam - visit the above page then scroll down to Steam for the relevant articles on checking if the addon shows in your library. If the license still doesn't get recognised or are no longer showing up in your library on Steam, contact your platforms support team.