title: Get member emails when using delta on group
body: <p>I'm trying to use the graph API to get a list of users which have been added to a specific group using the delta feature so I reduce the amount of data that passes through.</p>
  <p>However, when I <code>$expand</code> on the members property, I'm only getting the id, and not the specific properties I need (mail and some other details) - despite the fact I'm <code>$select</code>ing it.</p>
  <p>The url I'm using for the query is</p>
  <pre><code>https://graph.microsoft.com/v1.0/groups/delta?$expand=members($select=id,mail)&amp;$select=members&amp;$filter=id eq '&lt;myGroupId&gt;'
  </code></pre>
  <p>And the data I'm getting returned is:</p>
  <pre><code>[...]    
  &quot;value&quot;: [
          {
              &quot;id&quot;: &quot;xxxxx-xxxx-xxx-xxx-xxxxx&quot;,
              &quot;members@delta&quot;: [
                  {
                      &quot;@odata.type&quot;: &quot;#microsoft.graph.user&quot;,
                      &quot;id&quot;: &quot;xxxxxxxxxxxxxxxxxxxx&quot;
                  },
                  {
                      &quot;@odata.type&quot;: &quot;#microsoft.graph.user&quot;,
                      &quot;id&quot;: &quot;xxxxxxxxxxxxxxxxxxxxx&quot;
                  },
  </code></pre>
  <p>I want my members@delta to include the details of the member so I don't have to query for them seperately.</p>