You can enter the unique code only once. If you try again, you will receive an error message. In this case, check your mailbox to see if you have received the email from Essent. The subject of the email is: Surprise from Essent. Also, check your spam/junk folder to be sure. If the unique code contains a 0 (zero) or an O, try entering the other one (i.e., enter a zero instead of an O, or vice versa). The same goes for a capital letter i or the number 1.