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'had not confirmed' is correct and usable in written English.
You can use it when referring to something in the past that was not confirmed. Example: He had not confirmed his RSVP, so I was unsure if he was coming to the party.
Exact(53)
But, he added, clinical studies had not confirmed his findings.
Early on Friday morning, authorities had not confirmed the exact motive for the Nice attack.
He noted, for example, that Washington had not confirmed that the Taliban have taken over Rishkavour.
But he stressed that investigators had not confirmed the person's story.
The F.D.A. said that those subsequent studies had not confirmed that Avastin was safe and effective.
General Franks said that, thus far, tests had not confirmed the presence of chemical or biological weapons.
Buckingham Palace had not confirmed that the Queen was supporting Punk London at the time of going to press.
Bahamasair said our ticket numbers were "acknowledged" on the system, but BA had not confirmed the flights.
Mr. Ashcroft said yesterday that the authorities were investigating but had not confirmed any other planned hijackings.
Ford said it had two reports of minor injuries because of the problem but had not confirmed them.
Another survivor said that only three life rafts were on board, but officials had not confirmed that.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com