So I think there's no way to contact Bungie about this, I've only seen the Eververse forms.
I was checking armor synthesis and some of the armor was missing from the options, particularly the deep explorer boots (which I had unlocked previously for customization) and the gunsmith's devotion robes (which I didn't unlock for customization). The boots appeared unlocked in my collections, but the robe was also missing there, as if I hadn't previously get it, which I believe I did.
I don't know if this is an issue anybody else has experienced. Maybe it has to do with the reset to accounts they did a couple weeks ago?
Anyway, if someone can either help me with this or tell me who can I contact to have this sorted out, I'd be thankful.
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Deep explorer boots are a wide-spread known issue. The Gunsmith robes aren’t unlocked in collections, thus why not in transmog. Do you have proof of previously unlocking these on your account?