I’m from the UK and Alexa/ Sonos started working again for me late this morning.
I also removed Sonos skill from Alexa, removed Alexa from Sonos app and started again
It sounds to me like a simple need to reauthorise the Sonos/Amazon ‘sharing agreement’ token, usually fixed quickly by removing/reinstalling the Skill, but if people have tried that and also tried reinstalling the assistant on the speaker (‘the usual troubleshooting steps’) mentioned in the community here, then I guess it’s best that those who are still unable to solve their Alexa issue, should go onto contact Sonos, or Amazon Support, particularly as the Sonos services status page (still) shows the voice service is currently working normally.