ID Device for IoTAgent

I have a SODAQ ExPloRer to send data about temperature and humidity for a college project, at the moment that IoTAgent connects with the MQTT server we can’t visualize this ID we have a connection but can’t see the temperature on the application.
We tried to use the ID DEVICE the name that we register our SODAQ, whit the DeviceEUI and whit the number of the device but doesn´t work.
Does anyone know what my ID Device should be? Thank you!!