Earlier today, after we started getting the Dark Ages Currency, I purchased a couple of the Doom Cosmetics. (Earlier this afternoon).
It is now after midnight. I acquired more Dark Ages Currency and tried to purchase another Doom Cosmetic. I received an error message (300024) and had to exit the purchase. I tried different Doom Cosmetics to make sure it wasn’t exclusive to that specific item. None of them are currently working. (See image URL below).
Screenshot(s): https://i.imgur.com/7UXPqDC.png
Fifteen minutes later: It’s now working again.