I have earned the moonfang armor several weeks previously on my warlock from prophecy, but it is not available to unlock in the transmog menu. I have not unlocked it previously, and the armor is not on any page to unlock it. My friend has also gotten the armor, and he has unlocked it without issue.
I am going to try to earn another chestplate this week to see if that triggers the availability again, but i am unaware as to what the problem is.
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I see you have it equipped. I don’t believe you can use transmog on an equipped item. Try equipping another robe & then try to transmog this one.
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[quote]I have earned the moonfang armor several weeks previously on my warlock from prophecy, but it is not available to unlock in the transmog menu.[/quote] Because it's equipped. You have to unequip it before it appears as an option.