n8n - 💡(How to fix) Fix Slack event trigger failed with webhook

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Error Message

Describe the problem/error/question

What is the error message (if any)?

no error message, just nothing happened.

  • error: all

Code Example

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)
⚠️ WARNING ⚠️ If you have sensitive data in your workflow (like API keys), please remove it before sharing.
{
  "nodes": [
    {
      "parameters": {
        "trigger": [
          "message",
          "app_mention"
        ],
        "channelId": {
          "__rl": true,
          "value": "C0ARSKTBNLA",
          "mode": "id"
        },
        "options": {
          "resolveIds": false
        }
      },
      "id": "28a92dac-3311-423d-ab3d-240f2bdf4833",
      "name": "Slack Message Trigger",
      "type": "n8n-nodes-base.slackTrigger",
      "typeVersion": 1,
      "position": [
        0,
        192
      ],
      "webhookId": "2cd2b698-4975-4d73-9bfe-8fead3617a2a",
      "credentials": {
        "slackApi": {
          "id": "0wFs4OMwBpHEciyg",
          "name": "Slack Threat Intel Account"
        }
      }
    }
  ],
  "connections": {
    "Slack Message Trigger": {
      "main": [
        []
      ]
    }
  },
  "pinData": {},
  "meta": {
    "aiBuilderAssisted": true,
    "builderVariant": "mcp",
    "templateCredsSetupCompleted": true,
    "instanceId": "c8a9afe4973927343603648f06fec54f8906c272a71810fa7c3bc05beab9f7c8"
  }
}
RAW_BUFFERClick to expand / collapse
<!-- Please follow the template below. Skip the questions that are not relevant to you. -->

Describe the problem/error/question

I created a workflow with n8n that should be triggered by a Slack event (webhook). I connected Slack to n8n, added the webhook url, followed the whole playbook but when I created an event on Slack nothing triggered the workflow.

What is the error message (if any)?

no error message, just nothing happened.

Please share your workflow/screenshots/recording

<img width="1478" height="778" alt="Image" src="https://github.com/user-attachments/assets/482194dd-9655-4652-b47c-2337680c76d4" />
(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)
⚠️ WARNING ⚠️ If you have sensitive data in your workflow (like API keys), please remove it before sharing.
{
  "nodes": [
    {
      "parameters": {
        "trigger": [
          "message",
          "app_mention"
        ],
        "channelId": {
          "__rl": true,
          "value": "C0ARSKTBNLA",
          "mode": "id"
        },
        "options": {
          "resolveIds": false
        }
      },
      "id": "28a92dac-3311-423d-ab3d-240f2bdf4833",
      "name": "Slack Message Trigger",
      "type": "n8n-nodes-base.slackTrigger",
      "typeVersion": 1,
      "position": [
        0,
        192
      ],
      "webhookId": "2cd2b698-4975-4d73-9bfe-8fead3617a2a",
      "credentials": {
        "slackApi": {
          "id": "0wFs4OMwBpHEciyg",
          "name": "Slack Threat Intel Account"
        }
      }
    }
  ],
  "connections": {
    "Slack Message Trigger": {
      "main": [
        []
      ]
    }
  },
  "pinData": {},
  "meta": {
    "aiBuilderAssisted": true,
    "builderVariant": "mcp",
    "templateCredsSetupCompleted": true,
    "instanceId": "c8a9afe4973927343603648f06fec54f8906c272a71810fa7c3bc05beab9f7c8"
  }
}

Share the output returned by the last node

Nothing returned. this is the problem...

Debug info

core

  • n8nVersion: 2.20.7
  • platform: docker (cloud)
  • nodeJsVersion: 24.14.1
  • nodeEnv: production
  • database: sqlite
  • executionMode: regular
  • concurrency: 50
  • license: enterprise (sandbox)

storage

  • success: all
  • error: all
  • progress: false
  • manual: true
  • binaryMode: filesystem

pruning

  • enabled: true
  • maxAge: 720 hours
  • maxCount: 25000 executions

client

  • userAgent: mozilla/5.0 (macintosh; intel mac os x 10_15_7) applewebkit/537.36 (khtml, like gecko) chrome/148.0.0.0 safari/537.36
  • isTouchDevice: false

Generated at: 2026-05-17T11:45:28.359Z

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n8n - 💡(How to fix) Fix Slack event trigger failed with webhook