If you check Manage Clients > Edit Client > Permissions Tab in the Instagram admin and see if public_content is activated. If its N/A then when the Instagram api is called it wont let you get others peoples content, only yours. You can test this by going to https://api.instagram.com/v1/users/self/?access_token=YOURTOKENHERE&count=10 and if you get a successful call then you set everything up correctly, you just need to click the start submission button and after its approved the api should function properly.
