2.8 - Import Grades - Notifications not sending

Hello,

When I import grades into the gradebook I expect notifications to be sent to the learner that the grades have been added. this is not happening. All other notifications are sending as expected.

I'm using moodle 2.8 and importing an Excel CSV which imports grades successfully.

How can I get an email notification sent to the student telling them that their grades have been added?

I've been searching for an answer for hours.

Thanks,

Mark