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Are you adding a bank account or a debit card?
What error message are you getting?
Is the bank account in exactly the same name as your paypal account name?
Is it a UK bank being added to a UK paypal account?
Have you added that bank to any previous paypal accounts?
Does a partner or family member already have that bank account linked to their paypal accounts?
Has it been linked already x3 times to any paypal account?
If so then you would not be able to link it again.
Check out the link.