Thank you for writing in, that license code is owned by that username below (see secure note). If that account is yours please log in to that account and unlock the license so you can add it to your current account.
If not, please ask the owner to unlock the license from his account so you can add it to your current account.
You can register that license to your current account once it has been unlock.
Product Validation (see Registering a new license section)
Hope this helps,