I am in the UK. Last week we had a three day outage from Virgin Wifi

Changes in the house since.

Our router has a new name.

We have installed a new Chromecast.

Since then all other devices are back up and running with no problem. And Google home responds to voice commands for everything else

Our only issue is Spotify.

Spotify(or Google home) will no longer play our playlists via a voice command.

We have one routine that plays music when we switch some lights.

This music was one of our playlists. Now it is playing something else 

But it will play other music and connect to radio (BBC etc) when asked by voice

My wife and I have a duo account.

Both run Android on our phones 

One plus Nord and a Pixel 8a

So far we have

Unlinked our accounts. (various times)

Cleared the cache of both Spotify and Google home on both phones

Uninstalled Spotify.

Reset one of the speakers.

Made new playlists to try 

Changed playlist names

If we can't get this back it will probably be the chore of moving it over to another service.

Any ideas please?