Abstract: Systems and methods for linking an authentication account to a device may include processor(s) to maintain a plurality of authentication profiles, each authentication profile corresponding to a respective user and including at least one profile image, an immutable identifier, and authentication data used to authenticate the respective user. The processor(s) may receive a request including the device key, an immutable identifier, and a biometric image captured by a camera of a client device. The processor(s) may identify a subset of authentication profiles having respective immutable identifiers that match the immutable identifier from the request. The processor(s) may compare feature(s) extracted from the biometric image of the request to features extracted from the a profile image of the subset of authentication profiles, and link the device key of the client device with an authentication profile in a data structure to register the client device with the authentication server.