You can only add a person as a serial number administrator if they have the same email domain as the primary owner.
For the transfer to proceed, the target person must have an Intel account.
To add an administrator to your product key or serial number:
Go to the Intel Registration Center, and sign in with your username and password.
To see your current licenses, select the Licenses view.
To manage the license, select (…), and then choose Manage License.
To change the administrator and enter their email, in the Administrator row, select (…).
For more detailed information, see How do I add an administrator to manage my serial number.