<onBackPressed() not called / Android> I am testin...

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onBackPressed() not called / Android
I am testing a tiny Android App where I need to perform some action when a back button is pressed. I have prepared the following function in Kotlin:
override fun onBackPressed() {
super.onBackPressed()
println("onBackPressed CALLED")
}

I must be missing some detail, because the function is never called.
I expect it to be called when the back button is pressed.
Any comment from a second eye may be helpful.