@S_E_W,

My first thought is that it is because you are saying "Light" when you are technically turning off a Plug/Switch

Does saying switch instead work? You may try going into the device settings from the Google Home app - i think you may force it to be shown as a light instead. 

You could also configure a routing to figure out which voice command would be able to trigger the command

  @S_E_W,

Its not as much the naming of the device that needs to be changed, but the device type. You can switch the device between outlet, fan, humidifier, tv etc.

If your device is named as a light, but the device is still set and seen as a switch/plug - your Google Assistant may be getting confused. If the name of the basement is "Shop" it could also cause problems with the way that Google interprets your commands.

Try the routine feature to create different commands to see what command will actually allow the device to be controlled, as this will give a good idea of why it is being interpreted this way.

Normally you will hear that the Device has not been set up yet, or is unavailable - So I would recommend trying to relink your Kasa and Google Home Accounts. 

Also, make sure that you have moved the device out of the "Linked Devices" section and into a room.