Sometimes, on your account reports-page, you may notice the N/A label under the "Top Referral Domains" and "Top Referral Pages" sections, indicating unsegregated information.
This data is being classified based on the "referer" request header, which when missing prevents us from providing the necessary information.
Usually, browsers populate this request header automatically. However, in some cases (e.g. with native mobile applications) this header may be missing. Utilizing this header on your end can help us to better distinguish between the requests and give you more useful reportings.