title: How to integrate sso with ad with a lumen application already using oauth to login?
body: <p>I have an application which uses <code>OAUTH 2</code> authentication for login.
  Its backend is in PHP( <code>Lumen</code> ) and frontend is in Angular.
  Now I want to integrate <code>SSO</code> with <code>AD</code>(Microsoft AD), So when user is authenticated with AD we get his email, so how can i login the user with only email in my application using <code>OAUTH 2</code>. </p>