How to apply SSAS 2012 Tabular model Role based Security in SharePoint 2013

I have a use case where I have to showcase SSAS 2012 Tabular model role based security in

1. Excel 2013 opening from Desktop
2. Excel 2013 opening from SharePoint

I have created two roles in SSAS 2012 Tabular Model and applied to 2 AD users respectively. The restrictions in the roles are applying to the 2 users in Excel 2013 locally (working with Excel 2013 by connecting tabular model from desktop).

But the restrictions are not applying when opening the Excel that was published in SharePoint 2013 (The Excel was created by using BI Schematic connection created in SharePoint 2013).

I have added those 2 AD users under Site Owners group in SharePoint to gain access to the SharePoint site. They can able to create BI Schematic connections, Power View reports and Launch Excel 2013.

The issue is that the restrictions are not getting applied when opening Excel from SharePoint 2013.

Please help and provide me steps to be followed to solve the issue (am new to SharePoint).

Regards, Sujeev