Techniques for automatic cross-device meeting authentication

Technology for automatic cross-device meeting authentication. An example method involving initializing, by a first computing device, a real-time meeting communication session, wherein the first computing device is connected to a media system; receiving information indicative of a mobile computing device of a user being in a physical presence of the first computing device, wherein the user is associated with the mobile device and a second computing device; granting control of the real-time meeting communication session from the mobile computing device of the user to the first computing device; transmitting an instruction that causes the second computing device to display a user interface element associated with the real-time meeting communication session, wherein the instruction is sent after granting the control; and granting control of the real-time meeting communication session to the second computing device of the user in response to a selection of the user interface element.