Can't get deviceEUI from MKRWAN 1310 (Solved)

Using the following code the text gets printed every second in the Serial Monitor as expected.

#include <MKRWAN.h>

LoRaModem modem;

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.println("Your device EUI is: "); 
  //Serial.println(modem.deviceEUI());
  delay(1000);
}

However, when I uncomment Serial.println(modem.deviceEUI()); nothing gets printed in the Serial Monitor. Does anyone know what I'm doing wrong or what the problem could be?

Update: solved by uploading the MKRWANFWUpdate_standalone sketch

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