Wife and I play couch-coop, shes a necro and I maintain the Enchantress’ gear on her xbox account since they are both intelligence while I’m the crusader on my xbox account.
Setup the enchantress’ gear for GR pushing on her necro account and then decided to mail the enchantress’ gear to my crusader account. It all mailed successfully and when I then returned to the title screen and logged into my xbox account and got in-game as the crusader and accepted the mailed items, half of them just blinked out of existence.
Lost a Flavor of time, Cain’s pants, oculus ring, unity ring, and ancient Nemesis bracers along with five flawless royal topaz gems. Usually I just log the other character in on the 2nd controller and drop the items on the group to transfer the gear between accounts depending on who is going to be playing solo with the enchantress and never have a problem that way.
I have no confidence the mail system’s code now so will never use that again.