Extending identityAttribute

@dgomez - That is not correct. All API calls have to go through the SailPoint API gateway (*.api.identitynow.com) these days.

@Graeme_Jury_Tiger - Make sure that you have a valid JWT token issued from the OAuth 2.0 endpoint in our SailPoint API gateway (*.api.identitynow.com). If you get stuck, drop the token here, and we can show you a neat trick for troubleshooting this.