If the underpayment cannot be paid (e.g., surviving spouse not qualified, State received
                  payment as IAR, etc.), send notice SSA-L8166-U2 explaining the reasons for the denial
                  of the underpayment.
               
               Send notice SSA-L8166-U2 to any person who has filed an application or otherwise requested
                  a payment due a deceased individual and is not eligible to receive the underpayment.