This seems like a bug, but maybe I did something wrong.
When I connect to the Report Server via the Mobile app, I have the option to annotate and share the report page, just like I do with the Power BI Service.
It sends an image of the page and a link.
For some reason, the link tht the mobile app is sending is pointing at the Power BI Service.
If you follow the link, you get a message that says the report has been moved or you don't have accesss.