All but one device in the house have lost casting connections to the chromecast audio device. I have completed the following.
Factory reset on Chromecast audio. Working fine in test mode and annnoucements
Same wifi network on all devices. Restarted router
Removed all devices from the network to troubleshoot with just the laptop (Mac Pro 2021) - Has been working for months.
Cleared cache and history on the chrome browser
Here is the key highlight. Chrome browser on Youtube website can cast to the Chromecast audio device, as with several other music websites. Works well!!!
Spotify on browser and app can not. Chromecast audio device does not appear as an option!!!!
Spotify Premium account - New Zealand. Has been working until today for years.
Help, very much appreciated after hours troubleshooting.