Ok, so you've got the option, it just doesn't seem to do anything? This might sound daft, but when I made the Dungeoneering outfit, I remember it taking far longer than I felt it should - I though it was broken, and left it for some 30 seconds, before it magically worked. Might be worth putting the input to create the item, and then just leave it and see if it works after a period of time.
I suspect there's no coincidence here. I'm fairly sure I recall reading about someone else having a similar problem as well. I guess maybe there's something wrong with this item inparticular.