Is this the link you are using to turn in your steamworks trinkets? https://subeta.net/ss.php/menagerie/turnin

Can you try this other link and see if it works? This one is for turning in both steamworks and lounge trinkets at once. It's not linked anywhere but if it works and the other page doesn't, that will be a clue. https://subeta.net/explore/masquerade.php?act=turnin