All private accounts must be set to public in order to enter via hashtag. It takes approximately 15 minutes to an hour for photos or videos to automatically filter into your Submissions window.
Private Instagram profiles cannot enter photo contests via hashtag entry. Example. If your friend tests your photo contest and has a private profile, you'll be able to see the hashtag posted with the photo on their Instagram profile but not within Woobox.
Also, editing a post then adding a hashtag later will not be automatically entered. Users must include the designated hashtag with the original post.