You haven't perhaps got, or had, a stereo pair of Google speakers
configured and contained within your group? This messed me around as
after the Sonos court ruling, a stereo pair was considered another
group, and thus prevented multiple groups. Even ...
Provided you only have one speaker group, the Hub Max does play in it.
So the promise of multiple speaker groups returning and playing as
expected, is not yet true for me.
My groups did work again after deleting and reconfiguring. Strange thing
is that for my group volume change "automations,", the group is now the
"device" instead of my Hub Max initiating the start of the volume
change... the Hub Max also does not pla...
Th saga continues... Google will reinstate the multiple speaker groups
"within 48 hours" after successful appeal against
Sonos!!https://www.theverge.com/2023/10/10/23911491/google-home-grouping-features-now-available-sonos