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Coupon sent while redeeming credit card rewards point is not valid

Most of the credit cards are offering users reward points depending on how much they spend.
The reward points can be redeemed for gift vouchers or other items
The domain investor had redeemed the reward points for a magazine subscription voucher.
However when the domain investor tried to redeem the voucher, she is getting a message the code is not valid
A support ticket was raised, the screenshot of the error message was sent and a reply is awaited