Echo Dot failing to discover ST outlet type devices

I just purchased an Amazon Echo Dot, linked it to mt ST Hub and tried to discover my devices. It finds the Philips Hue lights but doesn’t find my bedroom lamp which is on a ST outlet. Any ideas on how to rectify this?

Inside the SmartThings App on your phone, go to “Automation”->“SmartApps”->“Amazon Echo” and make sure you add your outlet to the “Switches” section, click “Next”, follow the instructions on the next page and click “Done”.