I contacted chat and this is what they said:"
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Rupert: Welcome to Win Palace, how may I assist you?"
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kristen1: Hi! My username is kristen1"
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kristen1: I am trying to claim code WPC80 and it says it can't be redeemed at this time?"
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Rupert: One moment please."
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kristen1: sure"
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Rupert: Ok Kristen, the reason you could not redeem the bonus is because you have already redeemed a no deposit coupon in the past"
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kristen1: so it's for those who have never redeemed a free chip?"
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Rupert: It is for those who just opened an account ;/"
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kristen1: ok, thank you"
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Rupert: yw
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