title: How to authenticate user with Azure Active Directory using OAuth 2.0?
body: <p>I have a REST API written in C# and I need to authenticate with an existing Azure AD service. I currently have the username and password of the user wishing to authenticate. I need to authenticate with Azure AD and receive an access token from the server.</p>
  
  <p>Can someone please point me in the direction of some articles/tutorials that explain how to do this? </p>