title: Authenticate web application agains multiple azure ad?
body: <p>I am thinking about developing in general a web application for enterprise. What i am thinking about is following scenario:</p>
  
  <p>The application should be able to serve multiple customers (called multitenancy?). That means that multiple companies could use the software for their employees.</p>
  
  <p>Each of them could have a own azure ad or maybe not. Therefore i would like to know if it is possible to authenticate against multiple/different azure ad's?</p>
  
  <p>Lets assume that a user types in his email address user1@companyA.com then i would try to authenticate him against the ad whihc is configured behind the companyA.com ad, when someone tries to login with user361@companyB.com then i would try to authenticate against azure ad which is configured for companyB.com.</p>
  
  <p>Is this possible? How could i do this?</p>