Client error: `GET https://www.mailjet.com/de/wp-json/oembed/1.0/embed?url=https%3A%2F%2Fwww.mailjet.com%2Fde%2Fglossar%2Fwerbung%2F` resulted in a `400 Bad Request` response:
{"code":"rest_missing_callback_param","message":"Fehlende(r) Parameter: url","data":{"status":400,"params":["url"]}}