How to fix WC-40372-6

Most common reasons are:

• Code has been entered incorrectly.
• The code you are trying to redeem has expired or is not active yet.
• Your PlayStation™Network account region does not match the voucher's region.
• Your account does not meet the condition that the voucher is limited to.

Suggestions:

1. Make sure that the code is entered correctly.
2. Check if the code's date is valid, and also check if the voucher has any restrictions of usage.