Noonlight SmartApp Not Working

Noonlight only works when I manually trigger it. SmartThings is unable to trigger the alarm. SmartThings gives a device is disconnected error. After I accidentally triggered the alarm manually. The Noonlight app turns the power switch off. When I try to turn the power switch on it triggers the alarm. I've uninstalled, reinstalled and reconfigured the Noonlight SmartApp. Same symptom.

Noonlight is working properly when I use the SmartThings Classic App. Classic App shows Noonlight is in Standby mode while SmartThings App shows Noonlight is off.