Spotify updated last night, and this morning, I am unable to cast Spotify to either Google home or Chromecast. Google home informs me that I need to upgrade to premium, but I have confirmed that my subscription is current. If I try to cast from my Nexus 6p, the Home makes the sound denoting that I am connected, but the app continues to say "connecting" and plays music from the phone. I have rebooted both the Chromecast, and the Google home. I have quit the Spotify app and started it again, but to no avail.

Nexus 6p Android 7.0
Spotify app - 7.0.0.1371 armV7
Home - Cast firmware version: 1.21a.76933
Chromecast - Cast firmware version: 1.22.77272