My Sony SRS-X88 and SRS-X99 have been working perfectly well with
Nest/Google home for 6 years already on the same Ubiquiti network, some
are connected over 2.4 others over 5ghz, and multicast has worked
flawlessly. They all stopped about or month or...
I have the same problem with 5 Sony Wifi Speakers, as of few weeks ago,
they have been removed as default speakers for nest hubs. and I cant
re-add them. they are connected to the same network, visible and support
AirPlay, mDNLA, Chromecast etc. work...