I bought Witch Queen Deluxe edition on date 21/4/22 and just yesterday i finished the campaign without unlocking the dungeons.
The game said that i don't have purchased the dungeon key.
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Please fill out the form found at the bottom here: https://help.bungie.net/hc/en-us/articles/360049497351-Contact-Form-Missing-Eververse-Item-or-Add-On-Items