This is a limitation set by Instagram, which PLANOLY has no control over.
Enable Instagram Profile Search
Enable Hashtag Search
Enable Search By Username or Hashtag
To enable Discover Search, you'll have to authenticate PLANOLY through the Facebook Business page linked to your Instagram. Only Instagram Profiles that are Business Profiles will provide results from a Discover Search.
To enable Discover Search, visit your Discover Page and a message will appear for you to Enable Discover Search