docs: async def assign_users(self):
          """Update device properties."""
          device = self._devices[0]
          url = '{}/devices/{}?filter=ownerId,leftUserId,rightUserId' \
              .format(API_URL, device)
  
          data = await self.api_get(url)
          if data is None:
              _LOGGER.error('Unable to assign eight device users.')
          else:
              # Find the side to the known userid
              if data['result']['rightUserId'] == self._userid:
                  self.users[data['result']['rightUserId']] = \
                      EightUser(self, data['result']['rightUserId'], 'right')
                  user_side = 'right'
              elif data['result']['leftUserId'] == self._userid:
                  self.users[data['result']['leftUserId']] = \
                      EightUser(self, data['result']['leftUserId'], 'left')
                  user_side = 'left'
              else:
                  _LOGGER.error('Unable to assign eight device users.')
  
              if self._partner:
                  if user_side == 'right':
                      self.users[data['result']['leftUserId']] = \
                          EightUser(self, data['result']['leftUserId'], 'left')
                  else:
                      self.users[data['result']['rightUserId']] = \
                          EightUser(self, data['result']['rightUserId'], 'right')