Here, in the case of a voucher code that has been blocked by mistake, you can release it again. The only condition for this is that the voucher code has not yet been redeemed.
To do this, enter the corresponding voucher code in the input field and then click on the dark green button "CHECK AND RELEASE VOUCHER" to the right for final confirmation, which first checks whether the voucher 1. is actually blocked and 2. has actually never been used and then releases it again if both criteria are met.