Tiles, copy visual as image in powerbi using rest api

I am new in Powerbi. I have requirement to download tiles using powerbi api. tiles reside at below url.

https://app.powerbi.com/groups/me/apps/{appid}/reports/{reportid}/{ReportSection}

I have access to app, i can see the reports in Powerbi.

I have seen powerbi api documentation. when i try with powerbi api UI i get error as Response Code: 404

{"error":{"code":"PowerBIEntityNotFound","pbi.error":{"code":"PowerBIEntityNotFound","parameters":{},"details":[],"exceptionCulprit":1}}}