code: def assign_account_entitlement_for_user(self, body, user_id, dont_notify_user=None, origin=None):
          
          route_values = {}
          if user_id is not None:
              route_values['userId'] = self._serialize.url('user_id', user_id, 'str')
          query_parameters = {}
          if dont_notify_user is not None:
              query_parameters['dontNotifyUser'] = self._serialize.query('dont_notify_user', dont_notify_user, 'bool')
          if origin is not None:
              query_parameters['origin'] = self._serialize.query('origin', origin, 'str')
          content = self._serialize.body(body, 'AccountEntitlementUpdateModel')
          response = self._send(http_method='PUT',
                                location_id='6490e566-b299-49a7-a4e4-28749752581f',
                                version='5.0-preview.1',
                                route_values=route_values,
                                query_parameters=query_parameters,
                                content=content)
          return self._deserialize('AccountEntitlement', response)
docs: AssignAccountEntitlementForUser.
          [Preview API] Assign an explicit account entitlement
          :param :class:`<AccountEntitlementUpdateModel> <azure.devops.v5_0.licensing.models.AccountEntitlementUpdateModel>` body: The update model for the entitlement
          :param str user_id: The id of the user
          :param bool dont_notify_user:
          :param str origin:
          :rtype: :class:`<AccountEntitlement> <azure.devops.v5_0.licensing.models.AccountEntitlement>`