All I am getting on my galaxy phone is the ambient display and when tapping cast it goes to another screen and tap cast again and it goes back to ambient screen. Casting works fine from my chrome book. I have google home installed on both devices.
Thanks for reaching out. Are you casting from Chromecast-enabled app or you're mirroring your phone screen? Please make sure your phone is connected on the same network as your Chromecast and reboot your mobile phone. Rebooting your Chromecast and using a different mobile phone might also help.