Hi all, my number [...] has been verified by verification code. It is still shown as pending. Also, I cannot download a certificate.

Meta support advised "Upon checking, I can see that the display name for the phone number provided is already approved. As this phone number is registered on the Cloud API, you don't need to download the certificate from WhatsApp Manager to finish registration."

However, when I try to run POST https://graph.facebook.com/v18.0/{{Phone-Number-ID}}/register via postman.co with a 6 digit pin in the body I get the following error

"error": {
    "message": "Unsupported post request. Object with ID '435464246315001' 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": "Ao71rtkUvtCXT1aCKgzQuAp"

}

=> The access token has the permissions for - whatsapp_business_management - whatsapp_business_messaging

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Any idea what might be wrong?