Opened a reputation engram from shaxx and my inventory for emblems was full. Emblem wasn't in the post master. It shows it's unlocked in the collections as it's not grayed out, yet it doesn't let me reacquire it. It's even in my recently discovered in the collections.
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It’s not an emblem, it’s an emblem variant of the Fireforged Valor emblem. Inspect that emblem to use the variants.