Most mesh networks don’t have the possibility change channel,
unfortunately. Also, found this article
https://9to5google.com/2022/01/06/google-speaker-group-volume-changes/
So right now what get working is: start Spotify and cast to one (1) of
my Nest speakers. Then go to the Google home app > Media (green icon).
There I can add most of my speakers one by one. Not all of them but 4/6.
The other two works good when I use...