@Carl Thank you. I get the note when I edit any Siri shortcut that references Kasa. 

Also, when I run a Siri shortcut that references a Kasa scene, it doesn't run and  I get instructions to open the Kasa app and refresh the Smart page. This does nothing to resolve the issue.

  @My_Screen_Name 

I would just create a new Shortcut and see the new one works.

Wonder what's the 'Taget state' or Action you've setup in the Shortcut app?

  @Little_C New Siri Shortcuts that reference Kasa devices and scenes don't work. They have the same note, that they won't be supported in future versions of Kasa (which presumably means THIS version of Kasa).  "Target state" just means "Ask Each Time" - in the shortcut I provided the screenshot for my shortcut name is the name of the device, then Siri asks me if I want it on or off. (And it continues to ask me - but now doesn't execute it.

By the way I am using iOS 16.0.

  @My_Screen_Name 

Somehow 'Ask each time' worked for me when turn on or off a kasa device via Shortcut app.

Also IOS 16, probaly you need confirm the device is accessible in the kasa app, update the app or something like that.

  @Little_C Thank you for trying it yourself. For me, everything is accessible within the Kasa app, the app and iOS are up-to-date. 

@Carl What's the status on this? Since the Kasa app won't work with Siri, as it is I can't control any of the bulbs, plugs and switches I've invested in except through the app, which is not workable.