Our WhatsApp business phone number display name is approved. But name not showing while receiving messages. Only number showing. How can fix this.

I have previously succeeded in retrieving IG Hashtags via the API and in downloading media related to this hashtag seach. Now I would like to get the media information via the IG Media request. However i am not able to get the IG Media and get the following error message:
{
"error": {
"message": "Unsupported get request. Object with ID 'xxxxxx' 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": "ADoNIVirUIhWV6N0kovAum9"
}
}
I got the ID "XXXXX" from the "ID" field in the IG Hashtag Recent Media request. So the media id should exist.
The permission should be sufficient too as I temporarily granted all possible permissions in order to exclude this potential error source.
Any idea what the problem could be? I found similar inquiries, but they were all unresolved, so I am reposting them.

We are having problems with Facebook previews, our service shortens a URL and upon click/tap performs a redirect to the real destination. At the moment, however, Facebook extracts the preview of some of our URLs, but not others. Honestly, I don't understand the underlying scheme. I did some checks with the Facebook debugger to try to understand what's happening and the debugger says: Bad Response Code - URL returned a bad HTTP response code. Response Code - 403
here is a URL that returns a preview: https://developers.facebook.com/tools/debug/?q=https%3A%2F%2Fjo.my%2F6cwmjl
here instead is a URL configured in the same way that returns an error: https://developers.facebook.com/tools/debug/?q=https%3A%2F%2Fjo.my%2Fhqd3n8

ING: Greetings, I hope you can help me. I have problems with the “Instagram Basic Viewing” API, the problem occurs when trying to add a person, I check the “Instagram Evaluator” box and add the Instagram account; When you press the “add” button, a red pop-up message is displayed indicating: “The form cannot be loaded – Please verify that all the information entered is correct and try again.” The process reaches that point and I cannot continue.
ESP: Saludos, espero puedan ayudarme. Tengo problemas con la API “Visualización Básica de Instagram”, el problema se presenta al intentar agregar una persona, marco la casilla de “Evaluador de Instagram” y añado la cuenta de Instagram; al presionar el botón “agregar” se muestra un mensaje emergente en rojo indicando: “El formulario no se puede cargar – Verifica que toda la información ingresada es correcta y vuelve a intentarlo”. El proceso llega hasta ese punto y no puedo continuar.

When using the comment/replies endpoint, we are experiencing a transient error with the Message "(#100) Field is only available for top-level comments.". This Error occurs often but after undefined numbers of retries, the correct response is delivered.
Does anyone else have the same Problem or know a solution?