This was the reply don't know if it helps
Hi
The authenication code should have been emailed to him. Unfortunately, his email provider may have blocked the email as spam. If he hasn't already, ask him to check his spam folder. If it is not there, as him to try adding
noreply@proboards.com to his address book, and request the code get resent. If neither of these help, does he have an alternate email address he could try?