After I updated to joomla 3.9 and re-installed the user2user, I can't get it displayed on my front-end. I checked the access level in menu item, I set as "public". However, I login as a registered user but still get this message.
"Not authorised to view this resource".
I don't think it related to the update, because other modules: medal list layout, latest activity layout can still be displayed. I think it's a configuration issue but I really can't find the problem.