Cannot connect Lenovo Smart Clock with Google Assistant to Xfinity WiFi Network

I have replaced the device, switched 5ghz and 2.4ghz networks on and off, restarted all devices, completed factory resets and all other troubleshooting information that I could find. I am still unable to connect the Lenovo Smart Clock with Google Assistant to my Gateway router provided by Xfinity. Do you have any suggestions? Should I get a different router that works with smart devices?