Unfortunately, kibana_dashboard_only_user itself doesn't really work with reporting... The roles themselves actually work fine behind the scenes, it's just dashboard only mode always hides the menu items to create reports, and the user can't navigate to the reporting page in management.
BUT, the good news is, we'll be introducing Feature Controls in 7.2, which will make it really easy for you to do exactly what you are looking for: a user that only has dashboard & reporting access. So keep an eye out on our blog; we're hoping to release 7.2 in the near future
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