By Andrew Brown in Canberra

Two people involved in the former coalition government’s unlawful robodebt scheme have been found to be corrupt.

A National Anti-Corruption Commission inquiry on Wednesday found two of six people referred to it for investigation engaged in corrupt conduct, while it cleared the remaining four.

Those cleared included former Liberal prime minister Scott Morrison, who initiated the scheme while in the role of social services minister.

The watchdog found ex-departmental general manager of business integrity Mark Withnail carried out corrupt conduct by intentionally misleading the Department of Social Services during the preparation of a cabinet submission in 2015.

It also found department deputy secretary Serena Wilson carried out corrupt conduct by misleading the Commonwealth Ombudsman during an investigation in 2017.

Mr Morrison was not found to be corrupt, with his failure to realise bureaucratic advice was misleading put down to shortcomings by federal departments.

The corruption watchdog did not make recommendations in its final report, which followed referrals from the royal commission into the robodebt scheme.

The watchdog initially chose not to investigate the referrals before the controversial decision was overturned.

The over-ruling came after National Anti-Corruption Commission Inspector Gail Furness found commission head Paul Brereton engaged in misconduct as he had ties with one of the six officials but did not adequately recuse himself from decisions.

Between 2016 and 2019, the former coalition government’s robodebt scheme recovered more than $750 million from almost 400,000 people.

Many welfare recipients were falsely accused of owing the government money and the program was linked to several suicides.

The Albanese government has promised it will release a sealed section of the robodebt royal commission’s final report after the conclusion of the investigation.

“The illegal robodebt scheme was a betrayal of everyday Australians, resulting in human tragedy and untold misery,” Attorney-General Michelle Rowland said.

“The royal commission was clear in its findings and we must work to ensure this can never occur again.”