I have a few HS100/HS110 plugs all work fine in Kasa app on Android phone and have done for over a year. Kasa says firmware is up to date on all plugs. I created a very simple Scene called "ALL OFF" and use the widget to switch off all 6 plugs simultaneously. The Scene works.

I've now installed an Echo Plus and Alexa app. I can say "Alexa Plug One on" or "Alexa Plug One off" for example and can turn on/off that or any other named plug by voice. So far so good.

What I can't work out is how to use the Kasa Scenes in Alexa. The Scenes I have created are listed in Alexa app but I don't know what to say to tell Alexa to switch ALL OFF. If I say "Alexa scene all off" I just get back "all off doesn't support that".

Is there a guide to using Kasa Scenes in Alexa?