As @gouroufui explained, not all z-wave and zigbee devices work with ST unless a custom device handler is loaded onto your hub. It’s not that hard to do, this thread explains it well.
However it’s important to note that as the ST cloud was scaled up over time to accommodate new users, different “shards” were created. Not everyone’s hub can be accessed via graph.api.smartthings.com.
You won’t get an error message if you try to access your hub through that link, but you will not be able to load the custom code successfully.