Tried everything. Several times. Including different accounts, iOS-
based Home App, outdated version of Home App, used different names for
speakers, pair of speakers, added an additional room... Nothing works...
Same problem here:Google Home Max, Firmware 275994, Cast-Firmwareversion
1.56.275994I am in contact with Google Support, but so far no results.
Last request sent on Januar 2nd, still no answer.