I'm trying to get all photos by a specified hashtag from instagram API, not just the photos on my account. Since the changes of June 1, 2016 it doesn't work anymore. Any help? Thanks!
After June 1st 2016, you have to get your app reviewed and approved by instagram to get API access, if not you will be in Sandbox mode which will have access only to your account.
You also have to add public_content to scope during authentication and get approved by instagram to access hashtags from API.