An example imaging device includes a communication engine to transmit a broadcast message including a broadcast ID corresponding to the imaging device. The communication engine further is to receive a session token from a central server in response to a request for accessing the imaging device received from a user device in receipt of the broadcast ID. The session token is to connect the imaging device to a user session corresponding to a user of the user device. The imaging device further comprises a user authorization engine to obtain preliminary user details from the central server using the session token. The preliminary user details include a login ID and a user-selected authentication mode. The user authorization engine is to set-up a user login session using the preliminary user details for receiving user authentication approval from the central server to allow the user to access the imaging device.