@richlansdowne I have now managed to convince Sonos that it wanted to perform another update. After going through this (including it failing twice) Flic is up and running again.
Seems that something strange was happening on the Sonos end rather than the Flic.
I have many Sonos speakers in different rooms, I have 4 twists and about a dozen buttons. I updated Sonos a few days ago and now, nothing working from flic to Sonos.
I can refresh the speaker list fine and see all the speakers on there. But anything I select on any action tied to the buttons or the twists is just ignored by Sonos. I see the little icon pulsate in the Flic app to see that the app sees the action, but the communication to Sonos is broken.
If I change the action to ask Alexa to control the sonos then that works. Sadly, this means that the twists are suddenly completely useless as the 'volume' function is not usable via Alexa