Set the date on your phone to before 7th March and set up your
device(s). Then you can change the date back and everything should be
back. It's a pain but it works.
Yeah, it's just a shame I've reset all 4 of my Audio's. At least I still
have the Mini to use until (if) it gets sorted out. It was nice to be
able to wander around the house and have the sound synced in every
room...
I wouldn't mind so much if you could still get the audio only
Chromecast, I bought the second two when they were discontinued. I've
had them quite a while and don't expect anything to last forever, but...