Harmony + Light Switch issue

I’m finding some posts here from people who installed switches and were able to control them from Harmony. However I cannot figure out how to do it. I’ve successfully lingked harmony hub with smartthings. They can see each other just fine in both apps. However, when I try to refresh smartthings while in Harmony app, harmony sees the smartthings just fine but complains it didn’t find any compatible devices. I was hoping to see my GE zwave dimmer. Anything I’m missing?