Speaker Groups and Android/Google TV

[Cobjones]

I am having problems setting up Speaker groups when wanting to include TVs with Built in Chromecast.

I have several Minis, Google Hub, a Hisense TV, Nvidia Shield and TivoStream.

I can create speaker groups with the minis, Hub and Nvidia Shield, but I can't with the Tivo Stream or Hisense TV.

All devices are on the same Network. Ive reset every device and all devices are up to date. The version for the Chromecast Built in for all devices (working and not working ) are the same . 1.68.374976

It seems like I'm not the only one with this issue, but they keep closing out all the threads. Please help 

[Cobjones]

To add, I can cast individually to all devices, just not groups for the devices mentioned above. I assume this is a big since they are advertised to work the way described

[Cobjones]

Anyone help?

[TheJosh]

I have the same issue with a brand new Chromecast built in Sony Bravia TV, running the same version. I've seen one other active thread on this subject but no answer there either...