Im trying to get "long lived access token" for authenticated users as mentioned in the documentation. I am able to get short term access token but when i hit the endpoint for long term access token, it errors out giving the follwong message:

"error": { "message": "Unsupported request - method type: get", "type": "IGApiException", "code": 100, "fbtrace_id": "AXmRbDsV88IMpKQBqR2MqiV" }

Anyone knows how to fix it? Here's reference to what I'm doing: https://developers.facebook.com/docs/instagram-platform/instagram-api-with-instagram-login/business-login