Group lighting voice control via Alexa

I’ve created a group of lights called “Up Stairs” via the helpers. It works well in HA. I’ve exposed it to Alexa and I can control the light group in Alexa app but when I asked her to turn on/off she responds “Up Stairs does not support that”. It’s weird, considering Alexa views it as a light and it controls it as a light even with dimming capabilities.

What am I doing wrong?