Spotify on Windows app won't connect to Sonos Speaker

[DomJW]

The Spotify app on my windows 10 laptop won't connect to my Sonos Play:1 even though it is listed as an availble device.

It was okay up until just before Christmas but now it won't connect. The mobile app is fine though but doesn't offer the full range of functions as the Windows app.

Is there a way to fix this? I have tried uninstalling and reinstalling both the Spotify app and the Sonos app but neither worked. I have also tried reauthorising the account on the spotify app.