The guide you shared before is not up-to-date, the option to add virtual devices from the Developer Workspace is no longer available.
In the Dev Workspace, you have to create the ST Schema and SmartApp projects which:
- will have a device profile that you’ll use in the integration. This defines the device metadata (capabilities, presentation, etc.)
- is where you register them to install them from the ST app later. The information here includes:
- the URL where those projects are hosted
- OAuth credentials (if needed)
There are some users that mention they use the “Labs” tool in the app to create some simple devices but I believe it is not available for some regions.