Before adding you have to make sure your billing address march with your bank address, then go to wallet chose add bank, after that link your card and make sure your address is the same as your card address
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Check your billing address if the same as your bank address if it's not the same, you now change your address that merches the bank address then relink it it will be successful
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What you should do , check your billing address. Make sure the address you're using is the same address the bank registered with your card, then you have to update your address and link the card bao
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