QR Codes (Badges) must be "bright" enough for a student device camera to read properly. Make sure the students aren't shading their badges or tilting them downward when scanning. Having badges lighted by overhead lighing or an exterior window may help. Also make sure the badge itself is printed clearly on white paper for the best contrast. More recent releases of the RapidIdentity Portal software have also helped with the camera/scanning issue.
FAQ Block Topic