Preventing Unauthorized Access to Secured Information Systems Using Multi-Device Authentication Techniques

A computing platform may receive, from a client portal server, a request to authenticate a user to a user account. The computing platform may generate a first one-time passcode for a first computing device associated with the user account and may send, to the first computing device, the first one-time passcode. The computing platform also may generate a first registered-device authentication prompt for a second computing device associated with the user account and may send, to the second computing device, the first registered-device authentication prompt. Thereafter, the computing platform may receive first one-time passcode input and a first response to the first registered-device authentication prompt, which the computing platform may validate. Based on the validating, the computing platform may generate a validation message directing the client portal server to provide the user with access to the user account, which the computing platform may send to the client portal server.