API not working 404

Hello David,
im working on a site, and I am getting the following error while trying to access the api to get the gallery info as explained here:

https://www.smart-variations.com/knowledge-base/api/get/
This is my response

{
    "code": "rest_no_route",
    "message": "No se ha encontrado la ruta que coincida con la URL y el método de la solicitud",
    "data": {
        "status": 404
    }
}

What could this issue be about? I can access the other woocommerce endpoints correctly.
Thank you.