Are you talking about the built-in SmartWeather Station Tile device or the custom 2.0 version made by @takissd?
If it’s the original then log in to your IDE and check if the device is still listed under “My Devices”. If it is not, then click on “New Device” and choose “SmartWeather Station Tile” as the type. Name it whatever you want and type in any unique Network ID, then click Create.
If it’s version 2.0 then follow the instructions in this thread…