REST API create chat room cant add users

the request i make is

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<chatRoom>

  <naturalName>thename</naturalName>

  <roomName>76892329574cdee4b7b49a7453b6af70</roomName>

  <description>thename</description>

  <members>

  <member>aaaaaa@example.net</member>

  <member>bbbbbb@example.net</member>

  <member>cccccc@example.net</member>

  </members>

</chatRoom>

it creates the room but there are no users in it...am i missing something?