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Mine is not yet expired, but will be prior to the testing date. The site won’t allow you to register if your passport is currently expired, but will if it will expire in the future. However, a pop-up displays notifying you that your passport will expire prior to the testing date and provides the link to fill out the information change request form. CFAI indicated that you may register in such a case and simply fill out the form prior to the printing of exam tickets (it takes a week+ for them to update your info).