If you have been waiting for more than five minutes and have yet to see any of your Flair devices quit and reopen the App on your device or refresh your browser page.
If you still are unable to see any of your devices, make sure your Gateway Puck is connected to WiFi. If you have already completed WiFi setup, forget the WiFi network on your Puck (see Puck: Forgetting WiFi). In the App, click + → Add New Gateway Puck. Follow along with the on-screen setup wizard. You may need to exit Setup Mode in order to see the + button.
Add a new Gateway Puck: