Setting up a Smart Lighting Motion Sensor with an Echo (4th Generation) woes

Hi, I am trying to set up a new Smart Lighting Motion Sensor using a 4th generation Echo. Using the Ring app, I follow the instructions to add a Smart Lighting device. Scan the QR code, select Echo (4th Generation), and I get the "Please set up a compatible Alexa-enabled device. I follow those instructions, Echo sets up and connects to the Wi-Fi. Next I am asked if I would like to set up smart home devices, and follow those instructions. The Alexa app on the phone is looking for new devices but never sees the Smart Lighting Motion sensor. I have also gone in through the Alexa app on my phone and tried to add the device. I see the other Ring cameras. What am I missing??