Zoom

The Zygon and human versions of Petronella Osgood once called each other on Zoom. Meetings within it had IDs, with the Osgoods' meeting ID being "837-9623-5563". (WC: The Zygon Isolation)

Jo Jones was preparing to receive a demonstration of the twins' hip-hop music over Zoom, but they were interrupted when Clifford Jones brought an Auton daffodil in their home. (WC: Return of the Autons)

Cleo Proctor and Shawna Thompson both joined a Zoom call for the Requiem Group - a support group for those who are struggling with people going missing. Eventually everyone bar Cleo and Shawna disappeared with Shawna unaware that there ever was anyone in that group. Requiem then shifted character to say that she was coming for them. The Thirteenth Doctor hijacked the call and warned the duo not to touch the ghosts. (AUDIO: Requiem)

Behind the scenes

 * Zoom is a real website used for video calls.