title: How to update the users birthday
body: <p>I want to update the <code>birthday</code> of a user using the patch request. 
  Updating other properties works as expected but the moment the <code>birthday</code> property is included, the following error returned: </p>
  
  <blockquote>
    <p>The request is currently not supported on the targeted entity set</p>
  </blockquote>
  
  <p>I already tried to update the user to be sure the permissions are fine.</p>
  
  <p>Application permissions are used.</p>
  
  <p>This <code>PATCH</code> request to <code>/V1.0/users/{id}</code> works:</p>
  
  <pre><code>{
    "givenName": "Fridas"
  }
  </code></pre>
  
  <p>Passing this request body however:</p>
  
  <pre><code>{
    "givenName":"Fridas",
    "birthday" : "2014-01-01T00:00:00Z
  }
  </code></pre>
  
  <p>throws an error</p>
  
  <pre><code>{
    "error":
    {
      "code":"BadRequest",
      "message":"The request is currently not supported on the targeted entity set",
      "innerError":
      {
        "request-id":"5f0d36d1-0bff-437b-9dc8-5579a7ec6e72",
        "date":"2019-08-13T15:27:40"
      }
    }
  }
  </code></pre>
  
  <p>When I update the birthday separately, I get a 500 error. Print screens below. Updating the user id works fine, birthday does not.
  Same user id is used in the request.
  <a href="https://i.stack.imgur.com/NraMq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NraMq.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/hLRYs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hLRYs.png" alt="enter image description here"></a></p>