So. Mediators mediate super weird when it comes to systems they don’t own. As for transferring items? You’re on your own.
Regretfully had this happen to me once because a 3 post count 0fg account wouldn’t just give first.
Contact mediator.
Mediator tells party a to give gold to mediator.
Mediator then tells party b he has gold and to give item to party a.
Party b gives item to party a.
Party a and b confirm item has been given.
Mediator gives fg to party b.
It was… an experience.