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Unable to obtain access_token from custom social provider


Currently trying to integrate with a custom social provider though this guide:

However, the Fetch User Profile Script seems to fail because there’s no access_token, is there any way to determine the root cause for this issue?

I have been able to obtain an access_token manually through postman by putting in the same fields into the x-www-form-urlencoded body, and using the code from the URL and send it to the /o/token for an access_token. This is a fairly big service so it’s definitely compliant with oauth2