When a Shelly doesnt want to be included
Got a smart plug s and a relay 1L that the app could not include.
Use web interface: connect to the WiFi network “Shelly-XXXXXX.” If the WiFi network isn’t showing up, perform a factory reset on the device.
Go in a browser to http://192•168•33•1/. You should be able to configure the device from there, including setting it up on your home WiFi network.
Afterward add to app with add device by id.
Lesson learned: with shellies, do everything from web interface. Use MQTT.