shezzag, to confirm, are you trying to reconnect your Chromecast to the network and you're getting a no device found in the Google Home app? If yes, please manually connect to the Chromecast SSID. Here's how: Go to the phone’s Settings > Open WiFi and connect to the Chromecast SSID (Example: Chromecast1234, Living Room TV, Bedroom TV, etc.) > Go to the Google Home app and try to set up again. If the issue persists, try a factory reset on your Chromecast and reinstall the Google Home app.
Xbrsean, are you also getting the same message as the original poster? If yes, please try the suggested steps and let me know how it goes.
Just checking in to make sure that you've seen my response. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.