My google home can longer cast to groups. I'm a google guy it used to be easy now there is no option to cast to them. Clicking on the group icons takes me to the group settings screen and there is no option to cast to the group or control the volume. Those options no longer appear. It also tells me my device is not optimized for casting. This is new as well I am using a Samsung s20+ It may be time to quit google. There is serious competition now that works.