title: Power BI: Acess token is getting expired after 1 hours
body: <p>I am working on Power BI reports and integrating it into an app using sample code provided by Microsoft in Github. Client ID and the secret key should be copied into config file after registering the app in Azure Active Directory. I am able to get the access token using the dashboard sample where the user needs to log in and generate embed URL. Does anyone know how to refresh the token or extend the expire time as for now, it has only 1 hour after that report doesn't work?</p>
  
  <p>Thanks.</p>