The likely issue is you have picked up the wrong product. Our vouchers are coded so they are only redeemable against the product mentioned in your completed mission, so the scanner will reject any other products and will show an error message.
Some users are reporting issues using browsers that are not Safari or Microsoft Edge. This may be the problem! If you don't have these browsers downloaded, please download one and copy the voucher link over to have another go.
If you are still experiencing issues, please reach out to the customer service team at Zappit at customer-support@zappit.co who will be able to investigate further