[CoursePress Pro] Certificate Not Available

Two students have taken a course in the past week. Each student passed but do not have a certificate they can download.

The course 'students' section , on the backend of the site says to us, that they are [CERTIFIED]

The Coursepress>Students table for that course says that:
one student got %100 correct but the certificate is "Not Available".
other student got %73 correct but the certificate is "Not Available".

Why didn't they get a Download link in their experience?

Need help asap - Thank you.