In order to cast to a Chromecast from any device, both devices must be on the same network.
In most classrooms, the Chromecast is defaulted to a hidden network specifically assigned to each room. See the following link for a guide on accessing your hidden network:
https://simpsonco.atlassian.net/l/c/QnjQHm25
Our desktops are connected to our scsprivate network which means that we will need to change the Chromecast’s connection to scsprivate as well.