A workspace authentication system includes a conferencing device having a display screen, a bezel, and a plurality of three-dimensional authentication objects disposed behind respective portions of the bezel. Each three-dimensional authentication object is readable by a light detection and ranging (LIDAR) scanner and encodes authentication data. The bezel includes independently controllable regions configured to selectively reveal less than all of the three-dimensional authentication objects during an authentication workflow. A processor controls the regions of the bezel to expose the three-dimensional authentication objects according to a sequence, receives scan data corresponding to an exposed three-dimensional authentication object from a mobile user device, and authenticates a user when the scan data corresponds to expected authentication data for the sequence. In some implementations, the conferencing device displays a QR code associated with an authentication session, and the authentication workflow proceeds through successive authentication states before access to workspace resources is granted.