What is a 404 report?
404 means a page arrived at by error, such as when a visitor attempts to follow a short link that doesn't exist. 404 is "Not Found" reporting of all short links in your account. It is useful for finding specific click errors made by your users.
Reasons that 404s are generated can include typos involving case sensitive short hashes or situations where users enter the link manually. Other errors might be from expired links or related to URL edits - you updated a link but users are still trying to follow the old one. Bots sometimes fish for pages by trying various non-existant link names that also leads to errors. Error reporting covers last 90 days.
Login to your account and go to: Click Errors.