Okay this time we have detected the reason of the issue .
you have enabled all the touch points for the quiz submissions from lms -> settings -> touch points but the private messaging component was not enabled from wp-admin -> Settings -> Buddypress -> components .
I enabled that component and it fixed the issue please check the quiz by yourself now.
you have also set the all course page as two directory pages in buddypress pages settings .
i created a activity page and assign this page as activity directory page in your site .
Hi Alex,
Thank you so much. It now works.
With kind regards,
Charles