Power BI Report Server authentication issue

I have a web application and I want to embed Power BI Reports, hosted on Power BI Report Server. As I understand, the only way to render the Power BI Report is using an iFrame and I have defined the page to use an iFrame.

Whenever the page is loaded, PBIRS shows a dialog box asking for user credentials. Is there a way to provide the credentials in the background? I want to use a single set of credentials, and present the data to the user based on the current user's properties (managed in our application).

Any help is appreciated.