Co-Borrowers must create their own SoFi profile to access and sign their approval packet. To register, they should visit SoFi.com, click Log in, and select Create an Account.
Important: The Co-Borrower must register using the same email address entered by the primary applicant, as this is where the approval packet will be sent.
Also refer to: I get an error message "name is invalid" when adding my co-borrower. What should I do?