PSA: DON'T Buy TCG Cards for the Time Being!

[Boostins-lightbringer]

Pretty sure that just means there are issues not fixed relating to this (npc is back but non-functioning):

Known Issues – Dragonflight version 10.0.0 -- Updated October 27

Some NPCs who redeem codes from outside the game have been temporarily removed. They will return to their usual locations soon. The code redemption NPCs have returned.