Even when one does not possess knowledge of prapatti, when bharanyasam is performed through knowledgeable Acharya-s, they will perform prapatti on our behalf, and that will yield fruits.
Note:
It is documented that one can do bharanyasam on behalf of others. Specifically, an Acharya will do on behalf of a disciple. They will also do even for children. In this instance, even though a child does not possess the knowledge, Acharyan will perform on the child’s behalf – that is, one who is well versed will do so on behalf of the ignorant. Perumal will accept such bharanyasam.