Full thing object not returned when using API

I am trying to call the API from a third party service to get a sub-set of user things based on conditions. I have it working except I am only returned the last name, if they are active and the unique ID of each user. No way to get the other fields on the user thing data object. I changed to a different thing type and all were returned. Is the User thing special and not able to return all the fields?