When you create a new hashtag on Instagram, it can take up to 72 hours for them to send us the information after the first publication made on your new hashtag.
This new hashtag must be used on a brand new post in the caption in order to be acknowledged by Instagram and added to your Hashtag Tracker.
NB: Your new hashtag will not be acknowledged by Instagram and added to your Hashtag Tracker if you add it in the caption of an old post or if you add to the first comment of a media.