When I was in the seminary (this was back in the early 70s) a classmate of mine got an official-looking letter from Italy. My friend was born in Queens New York and is an American citizen. His parents were naturalized Americans who had emigrated from Italy.
The letter was in Italian, and he only knew a bit of the language so he handed it to his father. It was a draft notice - he was being drafted into the Italian Army! The letter ordered him to report to such-and-such location in Caserta Province (where his parents were from) in a month, or face arrest.
Apparently, when they were naturalized, his parents (or someone in the US government) neglected to inform the Italian government of the family’s status. Thus, to Italy, everyone was still Italian citizens, and my friend was subject to the draft.
Several trips to the Italian Embassy eventually straightened things out (whether it helped that my friend was in the seminary, I don’t know).