I have an old SmartThings Hub, model STH-ETH-001. It has been working fine for years, but I went to add a new device and ran into trouble. Since the last time I used my Smart Things Classic app, i changed phones. Once I logged in on the ST app my hub did not appear. When I try to add tbe hub, it asks for the welcome code which I’ve long since discarded. However, since the hub is already setup and working, why should I need a welcome code, shouldn’t the app just find my hub on the local Wifi network (yes my phone and ST hub are on the same SSID)?