I have this item in my inventory, and unlocked in my collections.
I could go as far as to say I believe I’ve already unlocked the ornament.
The thing is that it neither appears in my unlocked or locked ornaments.
This appears to be an error. As of now there is no possible way for me to obtain the ornament.
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This is a known issue, Bungie is working on it :D I have the same problem.