The Sonos One uses Wi-Fi rather than Bluetooth to stream music and at this stage does not support Google Play Music within the Sonos app. A way around that is to open Google Play Music and "Cast" to the Sonos One. It tricks it into accepting the stream and allows you to play your music without issue. Hopefully Sonos and Google sit down and work out their differences as not only would Google Assistant help this speaker but the full integration of Google Play Music would be handy too.