It's bugged. They current set of DC weapons don't count.
Only the old sets.
We will have to wait until they issue a patch for it.
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Ty, do you know if they are aware about this issue?
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They are aware [quote]Reprised Dreaming City weapons don't count toward Badge, blocking Seal[/quote] https://help.bungie.net/hc/en-us/articles/13265980348564-Destiny-2-Year-6-Known-Issues-and-Vital-Information
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