docs: function oktaErrorTransformer(err) {
    if (err && err.errorCauses) {
      err.errorCauses.forEach(function (cause) {
        if (cause.errorSummary === 'login: An object with this field already exists in the current organization') {
          err.userMessage = 'An account with that email address already exists.';
        } else if (!err.userMessage) {
          // This clause allows the first error cause to be returned to the user
          err.userMessage = cause.errorSummary;
        }
      });
    }
  
    // For OAuth errors
    if (err && err.error_description) {
      err.message = err.error_description;
    }
  
    if (err && err.error === 'invalid_grant') {
      err.status = 400;
      err.code = 7104;
      err.message = 'Invalid username or password.';
    }
  
    return err;
  }