How can I resolve the permission error when posting to a Facebook Page using n8n's Facebook Graph API node?

Below is a summary of what could be happening and an example workflow using the Facebook Graph API node in n8n.

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Troubleshooting the Error

The error

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(#200) If posting to a group, requires app being installed in the group, and \ either publish_to_groups permission with user token, or both pages_read_engagement \ and pages_manage_posts permission with page token; If posting to a page, \ requires both pages_read_engagement and pages_manage_posts as an admin with \ sufficient administrative permission

suggests that while your Meta app has the right permissions in the developer portal, the token you’re using may not have the two required permissions for posting to a page:

• pages_read_engagement
• pages_manage_posts

Key points to check:

1. Token Type:
   Make sure you’re using a page token and not a user token. When posting to a page, the page token must include both pages_read_engagement and pages_manage_posts. Verify in your token details whether these permissions are included.

2. App Role:
   Confirm that the account making the request is an administrator of the Facebook Page. The error indicates that sufficient administrative permission is required.

3. Live Mode:
   Ensure your Meta app is in live mode. Tokens generated in development mode might not have full access in production.

4. Refresh Token:
   If you made changes to the app (or its permissions), regenerate your page token. The Graph API Explorer is a good way to test token permissions.

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Sample n8n Workflow

Below is an example of a simple n8n workflow that uses the Facebook Graph API node to post a message to a Facebook Page. Replace {page-id} with your actual page identifier.

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{
  "nodes": [
    {
      "parameters": {
        "httpRequestMethod": "POST",
        "node": "/{page-id}/feed",
        "additionalParameters": {
          "jsonParameters": true,
          "options": {}
        },
        "bodyParametersJson": "{\n  \"message\": \"Hello world from n8n!\"\n}"
      },
      "name": "Post to Facebook Page",
      "type": "n8n-nodes-base.facebookgraphapi",
      "typeVersion": 1,
      "position": [
        600,
        300
      ],
      "credentials": {
        "facebookGraphApi": "Your Facebook Graph API Credential Name"
      }
    }
  ],
  "connections": {}
}

Notes on the workflow:

• The node uses the POST method on the endpoint /{page-id}/feed which is the correct endpoint for posting a message.
• Make sure your Facebook Graph API credentials in n8n have a valid page token with the required permissions.
• Test the node’s configuration by clicking Test. The trigger should go into listening mode, and you can use the Facebook Graph API Explorer to verify your token before running the workflow.

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Final Checklist

• Verify the token is a page token and includes both pages_read_engagement and pages_manage_posts.
• Ensure the Facebook app is set to Live.
• Regenerate your token if any permissions or modes were updated.
• Confirm that the account associated with the token is an admin on the Facebook Page.

Following the above steps should help you resolve the issue when posting to your company Facebook Page using n8n and the Facebook Graph API node.