Realtime issue - "UnprocessableEntity: %{messages: [%{payload: [\"can't be blank\"]}]}"

    const channel = createRealtimeClient({
        channelId: `${organizationId}:realtime`,
        defaultEvent: `validation-progress:updated`,
        token,
      });
      channel.sendMessage({
        payload: { message: "polygon-boundaries" },
      });