Summary emails addon – not sending?

Hi, I have installed and entered the license key for the summary emails addon. I configured the summary email tab on a couple of sample quizzes, set them to enabled and daily.

I saved the settings and clicked the “send test email” button. See screenshots attached.

I received the test email immediately, but waiting overnight I dont appear to receive any summary emails, despite completing / submitting some test quizzes during the day. I was logged in as admin and completing the quizzes.

What time of day (and on which day for weekly) would the emails be triggered – I cant see any day / time configuration and the documentation I can find doesn’t specify?
Is there something else that needs to be done to enable the triggering?
Do the summary emails only work for other non admin members?

This would be a useful addon so I would like to get it working.

Thanks

Tim