There can be multiple reasons for invalid vouchers. The following reasons are the most common:
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Expiration. The voucher has expired. Please contact the voucher issuer if you think there has been a mistake.
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Used. The voucher has already been used. Please contact the voucher issuer if you think there has been a mistake.
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Typo. There is a typo on the voucher code. Please recheck the voucher code and enter it again.