code: def update_publisher_members(self, role_assignments, publisher_name, limit_to_caller_identity_domain=None):
          
          route_values = {}
          if publisher_name is not None:
              route_values['publisherName'] = self._serialize.url('publisher_name', publisher_name, 'str')
          query_parameters = {}
          if limit_to_caller_identity_domain is not None:
              query_parameters['limitToCallerIdentityDomain'] = self._serialize.query('limit_to_caller_identity_domain', limit_to_caller_identity_domain, 'bool')
          content = self._serialize.body(role_assignments, '[PublisherUserRoleAssignmentRef]')
          response = self._send(http_method='POST',
                                location_id='4ddec66a-e4f6-4f5d-999e-9e77710d7ff4',
                                version='5.1-preview.1',
                                route_values=route_values,
                                query_parameters=query_parameters,
                                content=content)
          return self._deserialize('[PublisherRoleAssignment]', self._unwrap_collection(response))
docs: UpdatePublisherMembers.
          [Preview API] Endpoint to add/modify publisher membership. Currently Supports only addition/modification of 1 user at a time Works only for adding members of same tenant.
          :param [PublisherUserRoleAssignmentRef] role_assignments: List of user identifiers(email address) and role to be added. Currently only one entry is supported.
          :param str publisher_name: The name/id of publisher to which users have to be added
          :param bool limit_to_caller_identity_domain: Should cross tenant addtions be allowed or not.
          :rtype: [PublisherRoleAssignment]