Likely Democratic nominee Hillary Clinton failed to turn over a critical email she sent through her off-the-books email account during her tenure as secretary of State, the State Department confirmed Thursday.

“Let’s get separate address or device but I don’t want any risk of the personal being accessible,” Clinton wrote in an email exchange on Nov. 13, 2010, with Deputy Chief of Staff Huma Abedin.

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At the time, Clinton was utilizing a “.com” email address through her BlackBerry device which was routed through her home-brew server in the basement of her home in New York — instead of using an authorized “state.gov” email account.

However, the State Department didn’t uncover this key email exchange in the stockpile of emails that Clinton turned over — it was spotted on Abedin’s email account. The aide, who has a notably close relationship with Clinton, also had her own covert account hooked up to Clinton’s server and was forced to turn over work-related emails.

“That copy of the email was publicly cited last month in a blistering audit by the State Department’s inspector general, that concluded Clinton and her team ignored clear internal guidance that her email setup violated federal standards and could have left sensitive material vulnerable to hackers,” reported The Associated Press.

Clinton campaign spokesman Brian Fallon said “Secretary Clinton had some emails with Huma that Huma did not have, and Huma had some emails with Secretary Clinton that Secretary Clinton did not have.”

Fallon also asserted that Clinton turned over “all potentially work-related emails” that she still had in her possession when the State Department requested the emails in 2014, but declined to affirm whether Clinton deleted any work-related emails prior to being reviewed by her legal team, according to The Associated Press.

To read more about the latest on Clinton’s email scandal, click here.