after i validate from https://api.instagram.com/oauth/authorize/?client_id=" + clientId + "&scope=" + strScope + "&response_type=code&" + "redirect_uri=" + callbackUrl, instead of showing 
instagram is taking me directly into instagram.com
EDIT
Instagram solved this issue
OLD MESSAGE
Looks like it's an internal issue with Instagram API - we have the same issue and in the last 24h there are a lot of reports of this issue on StackOverflow. I think the best thing what you can do is report this issue here - more developers will report it, more likely Instagram team will fix it.
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