The American whose wife allegedly struck and killed a British teen was not registered as a diplomat in the UK — possibly rendering the couple ineligible for diplomatic immunity, a lawyer for the victim’s family claimed Tuesday.

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Jonathan Sacoolas was not named on the official diplomatic list, meaning he and his wife, Anne Sacoolas, may not have been covered by the protection, attorney Mark Stephens told the Guardian.

Stephens said this was confirmed by the UK’s Foreign Office, which handles Britain’s affairs around the globe.

The US Department of State did not immediately respond to a Post request about Sacoolas’ registration as a diplomat, but had previously said that “immunity is rarely waived.”

Stephens is representing the family of Harry Dunn, the 19-year-old motorcyclist who was fatally struck in Northhamptonshire in August — allegedly by Anne Sacoolas as she drove on the wrong side of the road.

Sacoolas, 42, initially cooperated with local authorities’ investigation, but eventually invoked diplomatic immunity and left the UK with her husband and their children, officials have said.

Their departure reportedly was urged by lawyers and US Embassy officials.

UK Prime Minister Boris Johnson on Monday urged Sacoolas to return to Britain and face justice — and vowed to broach the topic with President Trump if she refused.

Meanwhile, Dunn’s “broken” mom, Charlotte Charles, made her own emotional appeal to Sacoolas, who reportedly had been fined for her driving in the past.

“She’s got to be suffering as well. She’s a mom,” Charles previously told Sky News. “Without knowing who this person is properly, we can’t … start our grieving process.”

Additional reporting by Nikki Schwab