title: Retrieve Roles and Users per Application in Microsoft Graph
body: <p>I am developing a Application/Role/User Management web app using Microsoft.Graph.
  What I need is to retrieve the users and roles related to an application deployed in the Azure Portal.
  I was able to retrieve Roles and Applications by user using Client.Users[id].AppRoleAssignments but I have around 8000 users and I need to list roles and users per application.
  I have used Microsoft Graph and Azure.ActiveDirectory.GraphDirectory since I know some of that the Azure library is more comprehensive with no luck.
  I also tried using client.servicePrincipals but they are not returning users and roles as I expected.
  Could you give a hand of how could I accomplish this?</p>
  
  <p>Many thanks !!</p>