SSF4 AE PC Serial Question!

Hi guys, I have a question about my bought serial key for SSF4AE PC.
-Is the serial key only on one account usable?
Because If I try to make a new gamertag and copy my code to the new gamertag, I get the message that this code is already used by another profile.
Seems that this codes work only on one profile… :frowning:

The illustrious PC version of SF4 AE is in desperate need of its own forum section.

1 key per account

if you bought the retail version or steam version, you can use it with only 1 account
if you bought the digital version from Capcom Store, you can use it with 2 accounts