title: Cannot apply directory schema extension on User resource created through Graph Explorer
body: <p>Disclaimer: I am very new to all of this, so please be patient.  :)</p>
  
  <p>My aim is to create a directory schema extension targeting the User resources of my O365 company directory. The extension is very simple with just 3 string fields. The idea is that every user in the directory should have this extension applied to their User object with specific values for the 3 fields it contains.</p>
  
  <p>For this, I used the Graph Explorer, where I used my Admin tenant account to create a simple (domain verified) directory schema extension (domain_schemaname) with 3 fields, targeting the User resource.</p>
  
  <p>I can confirm that the directory schema extension is created with status <code>Available</code>, using <code>/v1.0/schemaExtensions</code>.</p>
  
  <p>After I updated the directory, I executed a Graph Explorer query to get the Extensions for myself (i.e. <code>/v1.0/me/extensions</code>), as well as of other users in the directory, however, the value of extensions node always returns an empty/null value(<code>[]</code>).</p>
  
  <p>I am confused, since I was under the impression that once I create a directory schema extension for a particular resource target (i.e. the <code>user</code> resource), the schema extension would appear immediately in the properties of any existing or new instance of a <code>user</code> resource. Then, I would be able to <code>PATCH</code> the specific user with the values for the directory schema extension. </p>
  
  <p>The issue is that when I try to add an extension to a User instance, through the Graph Explorer, it always creates an <code>openTypeExtension</code> type of extension, whereas I just want to assign the User just the contents of a directory schema extension already created in the <code>schemaExtensions</code> for my organization.</p>
  
  <p>So, it seems that I am not able to use Graph Explorer to apply a directory schema extension to a specific User object.</p>
  
  <p>Am I using the wrong tool for the job ?</p>
  
  <p>Can you advise how do I populate all the users in my O365 directory with the particular directory schema extension and assign a unique value for every user ?</p>
  
  <p>Do I need to use Microsoft Graph Client library and MSAL/ADAL to create a console app to create my directory schema extension and apply it to every user in my directory, and then update its value for every different user ?</p>
  
  <p>Thank you for your help.</p>