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"cannot say with certainty" is correct and can be used in written English.
You can use it whenever there is doubt or uncertainty about the veracity of a statement. For example, "The source of the leak is unknown, so I cannot say with certainty where it originated."
Exact(57)
The scientists cannot say with certainty now".
JODL: I cannot say with certainty.
RAEDER: I cannot say with certainty.
Experts cannot say with certainty which populations have been hit by the deaths.
We cannot say with certainty whether Mr. Bush lied about Iraq.
To what extent the Reich Foreign Minister personally remonstrated with the Fuehrer about the matter, I cannot say with certainty.
I cannot say with certainty how causally tied they are to my experience as a newborn of my mother's depression.
Although we cannot say with certainty, but these supports may have helpful in their professional development and their following of this code of ethics.
Similar(3)
What the exact number of the troops of each nation was I cannot say with certainty- for it is not mentioned by any one- but the whole land army together was found to amount to one million seven hundred thousand men.
"We cannot say with any certainty that cellphones are either safe or not safe," Dr. Black said on CNN.
This epidemic has been defined by its unpredictability and its geographic spread; we cannot say with any certainty when it will be over.
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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