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Hi Mack & welcome to the forum.
There is a known problem with some 13 pin socket test equipment. This is covered in the latest Special Notice issued by DVSA.
https://www.gov.uk/government/publications/mot-special-notice-01-19-towbar-electrical-socket-test-tools-diesel-smoke-meters-and-annual-training-and-assessments/mot-special-notice-01-19-towbar-electrical-socket-test-tools-diesel-smoke-meters-and-annual-training-and-assessments
It may be worth calling back & asking your tester to read the notice.