I've played that map a few times in elimination over the past few days and it isn't unlocked for me either.
Playing on XBox 360. Gamer tag is Aerosol Meat.
English
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So I can confirm that playing Black Shield map on a crucible playlist other than a House of Wolves elimination one unlocked the card. What's odd is that elimination was how I unlocked Widow's Court.
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Please send me a PGCR of you playing on that map so I can investigate.