This is the actual Instagram API error on this endpoint, and not specific to the token or client ID. I easily reproduced this by setting my account as confidential and checking several services (e.g. statigram or webstagram). And if the set of my account is public, everything is in order.
We report this issue using the error tool (from http://instagram.com/developer/clients/manage/ ). We have thousands of examples of this, so it seems global.
I hope this is fixed soon. This is not the most important API endpoint, but it is certainly better if it works; -)
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