API for Reports and Tiles Not Loading

I've created a c# app that queries the Power BI api for Groups, Dashboards, Tiles and Reports. I can successfully return Groups, Dashboards and Reports names and embed URLs for Reports. I get a "NotFound" error when I try to use the 

GET https://api.powerbi.com/beta/myorg/dashboards/{dashboard_id}/tiles URL for the request for Tiles. When I try to open a Report using the embed url in the iframe it continutes to try to load showing the travel dots across the page. Has anyone else experienced this? Thank you.