Sam Dastyari has taken extensive, apparently diligent action in his attempt to renounce his Iranian citizenship.
He may not want Iran, but Iran may want him.
In the 26 pages of material detailing Sam's efforts to renounce his citizenship and the obligations attaching to it there is no acknowledgement from the Islamic Republic of his release.
Iranian law requires that applicants for renunciation of citizenship complete their national service via conscription to the Iranian military. Sam hasn't.
Sam says he will refuse any order to present himself for military service. That approach didn't do much good for young Australians or Americans in the 1960s.
Sam seems to think the military service requirement doesn't apply to him - he just marks it N/A on the forms.
It seems to me that's unfinished business so far as Iran is concerned.
The closest Sam comes to having the Islamic Republic of Iran acknowledge that he is free from any obligation to it is a DHL docket showing his documents have made it to a lawyer in Iran.
Sam also tells us that he's visited Iran on an Australian passport and was given a tourist visa stamp, effectively (he says) acknowledging that Iran accepts his Australian citizenship.
It well may.
But it hasn't explicitly released him from his obligations by virtue of his Iranian citizenship, including an obligation to serve in the Iranian military for national service.
Perhaps Australia's High Court is the best place to settle the matter.