title: firebase phoneNumber not saving as expected
body: <p>I have a small react app that I am building with firebase auth.
  When I try to update a user profile as follows:</p>
  <pre><code>        auth.currentUser.updateProfile({
              displayName: firstnameRef.current.value+&quot; &quot;+surnameRef.current.value, 
              phoneNumber: &quot;+11234567890&quot;,
              photoURL: &quot;www.photo.com&quot;
          })
  </code></pre>
  <p>The display name and photoURL save, however the phoneNumber does not.
  Is there any reason for this. I am not getting any errors when attempting to save.</p>