Following TechNet article
you can get impression that Authored reports will be visible to all users by default.
Unfortunately, that is not a true.
If you want to make them visible to all users, you need to take additional actions.
- Open the address to the Report share in a web browser (exp. http://reportserver/reports )
- Create a New folder
- Move reports from "My Reports" to New folder
- New folder and reports should be visible now for all users