User owns data authentication within ASP.NET Web Application

[NealReeves]

I am a new developer working for a company who has an ASP.NET Web Application.  My job is to write code to prompt the organizational user to login to Microsoft Power BI to view the reports, dashboards, etc.  I have been using the example application given by Ted Pattison, which was created for App owns data, and trying to modify it with the .aspx files of the sample application created by Microsoft, which was created for User owns data.  I have not had success with it.  Could someone please share some helpful code snippets that are written for MVC applications or links to current examples? Thank you.