A parent did not receive the e-mail to confirm their details

Check spam, then the student can send it again from the portal.

Check the spam or junk folder for an e-mail from Caleb University headed “Your details are needed”.
The student can send it again from their parents and guardians page. A new link replaces the old one.
If the address itself is wrong, see “I typed my parent's e-mail address wrongly”.