docs: public Observable<ServiceResponse<OperationStatus>> addWithServiceResponseAsync(UUID appId, AddPermissionsOptionalParameter addOptionalParameter) {
          if (this.client.endpoint() == null) {
              throw new IllegalArgumentException("Parameter this.client.endpoint() is required and cannot be null.");
          }
          if (appId == null) {
              throw new IllegalArgumentException("Parameter appId is required and cannot be null.");
          }
          final String email = addOptionalParameter != null ? addOptionalParameter.email() : null;
  
          return addWithServiceResponseAsync(appId, email);
      }