When bot is in group chat, the callback for `.message` is not being called

Description

I’m registering a callback with the following code:

app.message(/ping/, (e) => { console.log(e) })

It is not printing anything if I’m on group chat. I see the message on the debug console, but it fails with error: Conversation not found.

[DEBUG]  bolt-app {"token":"k7PRs87qbRwzm4A4LAtOCSGb","team_id":"T0JV0MYCE","api_app_id":"A01Q2UP4HQQ","event":{"client_msg_id":"0b3149e4-1243-4a27-be4c-2aecb715cab9","type":"app_mention","text":"<@U01PDC4EB8B> ping","user":"UR62DEJCX","ts":"1614363797.012900","team":"T0JV0MYCE","blocks":[{"type":"rich_text","block_id":"fxp","elements":[{"type":"rich_text_section","elements":[{"type":"user","user_id":"U01PDC4EB8B"},{"type":"text","text":" ping"}]}]}],"channel":"G01PJFVB4GK","event_ts":"1614363797.012900"},"type":"event_callback","event_id":"Ev01PQKP3RNY","event_time":1614363797,"authorizations":[{"enterprise_id":null,"team_id":"T0JV0MYCE","user_id":"U01PDC4EB8B","is_bot":true,"is_enterprise_install":false}],"is_ext_shared_channel":false,"event_context":"1-app_mention-T0JV0MYCE-G01PJFVB4GK"}
[DEBUG]  socket-mode:SocketModeClient:0 calling ack events_api
[DEBUG]  socket-mode:SocketModeClient:0 send() in state: connected,ready
[DEBUG]  socket-mode:SocketModeClient:0 sending message on websocket: {"envelope_id":"889495a0-c7ce-4ad4-a7cd-5329ba5c7295","payload":{}}
[DEBUG]  bolt-app Conversation context failed loading for ID: G01PJFVB4GK, error: Conversation not found

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• example code related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I’ve read and understood the Contributing guidelines and have done my best effort to follow them.
• I’ve read and agree to the Code of Conduct.
• I’ve searched for any related issues and avoided creating a duplicate issue.

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Bug Report

Reproducible in:

package version: 3.2.0 node version: v12.13.0 OS version(s): Ubuntu 18.04

Steps to reproduce:

1. Listen to anything using the .message call
2. Add the bot in a group chat with at least two people
3. Mention the bot with the message that it should listen

Expected result:

The callback to be called

Actual result:

The callback is not called, and the DEBUG info prints Conversation not found

What I also tried

Checked that the bot CAN post to the group conversation Checked with app.receiver.client.on('slack_event'...) that the message is visible

[seratch]

@manucaicedo Is A01Q2UP4HQQ your app’s ID (I found this ID in your issue decscription)? If so, please visit https://api.slack.com/apps/A01Q2UP4HQQ/event-subscriptions and make sure if message.mpim is in the bot events.

[seratch]

Thanks for your prompt reply. Just in case, I’ve verified if there is no issue with Bolt’s handling with the following code.

const { App } = require('@slack/bolt');

const app = new App({
  socketMode: true,
  developerMode: true,
  token: process.env.SLACK_BOT_TOKEN,
  appToken: process.env.SLACK_APP_TOKEN,
});

app.message("ping", async ({ message }) => {
  console.log(message);
});

(async () => {
  await app.start();
})();

The result was that my app.message printed the message object for both public and private channels.

What I did are:

• Create a new Slack app at https://api.slack.com/apps
• Settings > Socket Mode - Turn Socket Mode on
• Features > Event Subscriptions - Add the following bot events
  • message.channels
  • message.groups
• Settings > Install App - Install the app to grab a bot token (xoxb- token)
• (in your Bolt app project) Set SLACK_APP_TOKEN and SLACK_BOT_TOKEN in env variables
• (in your Bolt app project) Run the app (say, npx node app.js)
• (in the installed Slack workspace)
  • Create a private channel
  • Add the app to the channel
  • Say “ping” in the channel

The only difference in Bolt I can imagine here is that the framework intentionally ignores most events generated by the apps’ bot user itself. This is helpful to avoid unintentional infinite loop situation.