One of the reasons is that we do not know to whom citizens have given their social insurance number. The social insurance number should only be used as an identifier to link certain information to provide benefits. Individuals are the only ones who know to whom they have given their social insurance number and for what purpose. You can give your social insurance number for private pensions, insurance and car rentals or purchases, for example.
The social insurance number should not be used to identify the person. This is a number that allows you to link certain files. We need this number to link the information. We now link the two social insurance numbers in our systems, but the first should never again be used by the individual.