[cyberax]

That's because there are SSNs shared by multiple people.

[blindriver]

https://www.credit.com/blog/the-most-misused-social-security...

[tormeh]

What? That sounds less than ideal.

[caspper69]

It usually wasn't intentional: https://www.ssa.gov/history/ssn/misused.html

The system still has to disambiguate and support the prospect of it happening though.