title: Non-interactive user authentication using AAD v2
body: <p>We are exposing a service written in ASP .net Core Web API, and using AAD V2 and claims based authentication.
  Our clients use Microsoft and MSA accounts which are supported in the V2.</p>
  
  <p>We have a requirement which the consumer need to consume our Web API from a windows service.(non-interactive)
  We understand that the resource owner password credentials are not supported in the AAD V2.</p>
  
  <p>We tried using the client secret approach, but we cannot distinguish a particular user form this approach as we are not getting a UPN or unique value.
  Can you please let us know if there is an alternate approach which we can use in this scenario.</p>