Hi,

Might be due to missing access rights ? First make sure that the modules has got installed without any error. Then check whether the logged in users have privilege/access rights to see the menu/app .

Login as Admin and see the Groups assigned for the corresponding menu, you can see it from: Settings -> technical -> user interface -> menu items, search for missing menu and open it and see which is the user group assigned for the menu.

Once you get the user group, check whether the users are added in that users group.

Thanks