An Argentine DNA bank disproved claims by the founder of the Grandmothers of the Plaza de Mayo that she had found her long lost granddaughter.

After nearly 40 years of never giving up hope of a reunion, María Isabel Chorobik de Mariani announced she had been reunited with her granddaughter, Clara Anahi Mariani, on Christmas Eve.

Newly elected Argentine President Mauricio Macri took to social media to express his happiness about the reunion. "Joy for the recovery of the granddaughter 120. It is a triumph of the search for truth and the defense of the right to identity," he tweeted.

However, BBC Mundo reports the National Genetic Data Bank in Argentina has corrected this information.

Initially, it was reported that a private laboratory established a genetic link of 99.9 percent between the two women. After the alleged granddaughter met her supposed grandmother, the DNA testing was done again, and both reports were revealed to be inconclusive.

In 1976, Clara Anahí Mariani was taken away by military officers, who also killed her mother, when she was only three months old.

The 92-year-old Chorobik de Mariani said she was not discouraged by the news and would continue her search, the Telegraph reports.

In November, the Grandmothers of the Plaza de Mayo announced the discovery of their 119th child, a 38-year-old man named Mario Bravo.

The Grandmothers of the Plaza de Mayo strives to locate children who were stolen and illegally adopted during Argentina’s “Dirty War,” which lasted from 1976 to 1983.

In the 1980s, Mariani broke away from the Grandmothers of the Plaza de Mayo, which she co-founded, and in 1996 started a new organization named after her missing granddaughter: Foundation Clara Anahi.

Around 500 babies are thought to have been kidnapped during the war.