title: "AADSTS900144: The request body must contain the following parameter: 'grant_type'.?
body: <p>I built an app in my Azure ad b2c tenant and configured it as shown, but why can't I request an access token in postman?</p>
  <p><a href="https://i.stack.imgur.com/UYi9R.png" rel="nofollow noreferrer">app registration</a></p>
  <p><a href="https://i.stack.imgur.com/JLhmw.png" rel="nofollow noreferrer">API permissions</a></p>
  <p><a href="https://i.stack.imgur.com/2cLJU.png" rel="nofollow noreferrer">postman screenshot</a></p>
  <p>Here are the links to the two documents I follow：</p>
  <p><a href="https://docs.microsoft.com/en-us/azure/active-directory-b2c/microsoft-graph-get-started?tabs=app-reg-ga" rel="nofollow noreferrer">Register a Microsoft Graph application</a></p>
  <p><a href="https://docs.microsoft.com/en-us/graph/auth-v2-service#4-get-an-access-token" rel="nofollow noreferrer">Get access without a user</a></p>