I've added ths before, but it was closed (id 1824468).
I did all the things suggested, problem is still there.
A lot of times spotify doesn't find the chromecast audio device. Reinstalled spotify, changed access point, have no offline playlists, occurs on several phones.
A restart of spotify usually helps. More information is in the closed issue ( https://community.spotify.com/t5/Ongoing-Issues/Unable-to-find-chromecast-devices/idc-p/1905264 )
Hey folks!
Hopefully everything's working fine now. It's been a while since the last update, so for now we'll be closing the post. Feel free to get back yo us if you still need assistance.
Take care!