hello, im really sorry for the delay, i was not active on the forum for a while.
did you find a solution for that?
this is new encrypt system fivem add some weeks ago, in order to run the script you must use same email in tebex and in your fivem account (keymaster) if you bought it from another account or another person bought it from you, he/she can transfer the script to your account from his/her keymaster
read more: Introducing Asset Escrow for your resources