How do I use the epic synthesis weapon coupon on my main while I got it on alt?

[Chaos]

I have the coupon on my warden, but I want to use it on my gear master, however, the coupon is bound to my warden, and at the same time I cannot buy the cannon on my warden (the "buy" button is faded in the vault, only the "buy" buttons for quiver and longbow are available) Can anyone help me with this question, I really appreciate your help =)

[iAmNotHere]

server storage your coupon and get it on your tinker. it cost 0 ec/et. just select one of payment option.