When I call the each voice commmands the ESP32 turn the white led on (callback firstLightChanged).
I did these testes:
I set the callback secondLightChanged to both commands and it worked turning the red led on.
I reversed the order of adding devices and now only the secondLightChanged callback is acting.
if (wifiConnected)
{
// Define your devices here.
espalexa.addDevice(Device_2_Name, secondLightChanged);
espalexa.addDevice(Device_1_Name, firstLightChanged); //simplest definition, default state off
espalexa.begin();
}