The fingerprint method is only used if the user's browser does not accept cookies.
When a user accesses the website, the pixel checks whether an Ever ID/cookie exists. If this is not the case, a new Ever ID is generated and a new cookie is stored. If the user blocks cookies, an Ever-ID is generated, but no cookie can be set. Instead, a fingerprint ID (FEID) is formed. The syntax for Ever IDs of users without cookies follows the same rules, so that the evaluation in the frontend is equally possible (see End Devices Visitor IDs).