Disclosed embodiments may include a system for determining trusted devices. The system may receive data corresponding to a plurality of users. The system may receive, via a plurality of user devices associated with the plurality of users, a respective request to conduct a plurality of transactions. The system may generate, via an MLM and based on the data, trust scores associated with the plurality of users and the plurality of user devices, wherein each trust score indicates a probability that a user device, of the plurality of user devices, is associated with a user of the plurality of users. The system may determine whether each trust score of a plurality of trust scores exceeds a predetermined threshold. Responsive to determining a trust score of the plurality of trust scores exceeds the predetermined threshold, the system may conduct fraud prevention action(s) with respect to a corresponding user device and user.