Gocontrol switches not connecting nor resetting

I got several gocontrol switches (some dimming, some not) from a friend who switched away from a wink setup that he used to have. I’m following directions from the gocontrol website as well as additional tips on the web and I’m having zero luck getting them to connect via the current smartthings app. no blinking lights, nothing. I have a hunch that they need to be reset but I’m gaining no traction. Any tips? Much appreciated!