I have a hidden SSID for just IoT devices. On the mobile app, go to Device Health > Change Wi-Fi Network. Select Continue and follow the instructions. Join the Ring network so the app can talk directly to the doorbell. At the very bottom in light grey select “Add Hidden Network”
Enter your hidden SSID. Select your encryption method, WPA hopefully 
Enter your password and select Continue.
You should now be connected to your hidden SSID