I am using the Instagram Basic Display API OAuth flow to authenticate an Instagram account within my web application.

Once they have authenticated successfully, I am exchanging the short lived access token for a long lived one, code snippet below:

url = "https://api.instagram.com/oauth/access_token"
body = {
    'client_id': CLIENT_ID,
    'client_secret': CLIENT_SECRET,
    'grant_type': 'authorization_code',
    'redirect_uri': REDIRECT_URI,
    'code': CODE
}

I have tested this for various Instagram Professional accounts. For some, I get a HTTP 200 response and I am able to get a long lived access token. But for others, I get the following response:

{
    "error": {
        "message": "Unsupported request - method type: get",
        "type": "IGApiException",
        "code": 100,
        "fbtrace_id": "AtnOFqdYDJ9lDj2GgOwv7EE"
    }
}

Researching on the internet this looks like a bug on Facebook's side, and that this happens somewhat randomly. Can someone please explain why this is happening and implement a fix as soon as possible? My application relies on users being able to authenticate using their Instagram Professional account and this bug is preventing critical features from working.