Hola, puedes ver la respuesta en el área de soporte de RegisterFLy:
Cita: Where can I find the Authorization code for my domain?
Cita: :: Answer
Kindly use the following steps to be able to gain auth code and unlock a domain.
1 Log into your Registerfly account
2 Click on total domains
3 Click on the domain for which you require auth code
4 It will say locked at the domains properties click on it to unlock the domain.
5 Click on domain contact information (plus sign)
6 Press configure
7 On the next page will be to see the auth code for the domain at the bottom of the page.
Please also remove the protect fly for the transfer of domain.
Saludos!