I had a similar problem and that is how I fixed it.
You must uncheck the box " Disable Implicit OAuth: " by clicking on the link:
β Customer Management
β Click "Edit" in the / webapp application.
β Uncheck - disable implicit OAuth:
β Update the settings and try again by clicking on the link:
https://api.instagram.com/oauth/authorize/?client_id=CLIENT-ID&redirect_uri=REDIRECT-URI&response_type=token
In the link, replace the values ββthat were provided to you in response_type , specify the token value to get the access token, and if you want to get the request code , just replace the token with the code in the URL.
Hope this helps you and future viewers .. Good luck .. :)
mike20132013
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