WC-40371-5 PS4 Error Code

The voucher code you entered is not valid.

1. Make sure that the code is entered correctly.
   
2. Check the date on the voucher. It is possible that it is not available yet or that it has expired.
   
3. Check if your PlayStation Network account region matches the voucher's region.
   
4. Check if the voucher has any restrictions of usage.