WhatsApp API in Postman not working after setting up the trigger in n8n

Questions
1

Hi everyone,

After testing the On Message trigger for WhatsApp, I encountered an issue where my configuration in Postman stopped working.

I suspect that n8n changed some permissions, and my user no longer has access. The API response in Postman is:

{
    "error": {
        "message": "Unsupported post request. Object with ID '<Phone-Number-ID>' does not exist, cannot be loaded due to missing permissions, or does not support this operation. Please read the Graph API documentation at https://developers.facebook.com/docs/graph-api",
        "type": "GraphMethodException",
        "code": 100,
        "error_subcode": 33,
        "fbtrace_id": "A4iSdyUZdnnkb-S2vkB7Rqn"
    }
}

Does anyone know how to restore the configuration for my system user?

Thanks!

2

It looks like your topic is missing some important information. Could you provide the following if applicable.

  • n8n version:
  • Database (default: SQLite):
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Docker, npm, n8n cloud, desktop app):
  • Operating system:
3

I add the requested information:

n8n version: 1.76.1
Database (default: SQLite): default
n8n EXECUTIONS_PROCESS setting (default: own, main): I’m new to n8n, I don’t know what this is. I guess I used it by default.
Running n8n via (Docker, npm, n8n cloud, desktop app): Docker
Operating system: Ubuntu 24.04.1 LTS

My access token no longer worked and I solved it by deleting the App and the configured WhatsApp account in Meta to start again.

I guess the trigger in the background associated a new access token and a new webhook in Meta. But I didn’t find how to restore access to my system user. I’m just getting started with these new tools.

Thank you

4

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