title: How to access custom sign up field via AD Graph API
body: <p>I'm using <a href="https://graph.windows.net" rel="nofollow noreferrer">https://graph.windows.net</a> with credentials to access user data held within B2C AAD</p>
  
  <pre><code> string graphRequest = $"https://graph.windows.net/mytenancy.onmicrosoft.com/users/" + UserName + "?api-version=1.6"
  </code></pre>
  
  <p>Where UserName is the ObjectID for that user</p>
  
  <p>I create an object to handle the resulting data, e.g.</p>
  
  <pre><code> displayName
   mail
  </code></pre>
  
  <p>I can deserialize the result and use the info from the profile</p>
  
  <p>I've now edited the SignUpSignIn policy to add a custom field, a string, called StandID</p>
  
  <p>When I view the profile through Postman, the name of that appears to be</p>
  
  <pre><code>  "extension_5295e65f1adc497186f72d63f5210d51_StandID": "E35"
  </code></pre>
  
  <p>However, I cannot seem to access the value via the same method, it comes back blank when I try and access it by the name given</p>
  
  <p>Any idea what I'm doing wrong?</p>