Not receiving verification code after password change

Hi, I am trying to help my father out who is having issues with ring app (android) after installing on his new phone. App was installed but he is not receiving the emails with the verification codes when trying to log in from new device. He changed his password and got an email through saying password was changed but when we try to verify on log in we again don't receive the email with the codes. He phoned ring support yesterday but the girl on the phone was about as much use as a chocolate fireguard and her go to response was "Well the email has been sent". I've checked through his spam folder etc and no sign of any emails from ring with a verification code. Any help would be greatly appreciated as he is starting to nip my head about it.