How do I load person national identifiers?

You must include any formatting characters in the value that you specify on the NationalIdentifierNumber attribute of the Person National Identifier component.

For example, to load the US social security number 987-65-4322, you must include the hyphens. Don't specify the number as 987654322. If you omit the formatting, which is country-specific, then duplicate person records aren't found when the checking is based on national identifier.