this is the same issue i am having. everything worked fine yesterday. tried all the tricks... turn phone and google home off/back on, disconnect the reconnect accounts from each other, updated apps, nothing is working.
I'm glad I'm not going crazy. I usually use Spotify to play pink noise all night for my daughter and I was unable to do that last night because this wasn't working on any of my devices. I'm having the same error as everyone else where it says it's connecting forever and never connects. I will say though that I've been having issues with it disconnecting or lowering the volume or stopping the song in the middle for no real reason for about a month and a half now. We'll even get the error that someone else is using our Spotify and no one has touched it. 🤦🤷