Each Software Token has a unique serial number assigned to it. This number is required for registering your Software Token. Please keep the serial number in a safe place and archive the email as it may be required to remove the Software Token from the account when contacting the SQUARE ENIX Support Center. The serial number usually will begin with the letters ‘FDL’. You can view the Software Token serial number in the registration email for the Software Token sent to your registered SQUARE ENIX email address.