Encoding is super important! When experiencing issues, this is almost always the culprit!
First bold is the new version. Make sure you are using version 1.1. Second is the site you supply being URL encoded.
https://opengraph.io/api/1.1/site/https%3A%2F%2Fwww.instagram.com%2Fp%2FBgj0KjchXrt?app_id=XXXXXXX
Feel free to reply to this topic if you have any questions!