Abstract: Systems and methods for providing a single sign-on for authenticating a user via multiple client devices is provided. For example, the system includes a processor configured to receive a first connection request from a first client device. The processor processes the first connection request and transmits an access token to the first client. The processor can further receive a second connection request from a second client device and process the second connection request. The processor can transmit a single sign-on response to the second client device in reply to the second connection request. The second client device can be configured to communicated with and transmit the single-sign on response to the first client device for processing. The processor can receive a single sign-on verification from the first client device, process the single sign-on verification, and transmit a copy of the access token to the second client device.