The easiest thing is to wait for your next international trip then do OLCI as part of that process you will be given the opportunity to scan your passport once there is a scan of your passport in your profile you will show as verified, the delta scanning technology is fussy but it will work

if You do it at a kiosk do OLCI then go to the kiosk prior to the check in counter the kiosk will ask you to scan your passport and give you an option to save,