Hello @Ifeoma1,
Welcome to PayPal Community Forum and thank you for posting!
I am sorry to know about the trouble while adding a card. Sometime, our security program considers a variety of factors at each activity to keep you safe. Any activity of adding card/bank can often be blocked or declined if we detect any unusual or suspicious activity or not safe for your account in the future. In this situation, kindly try again at later time. If you're still unable to link the card, please reach out to our customer support team through the available contact options on our website so that our representatives can help you accordingly.
Good Luck,
Ayesha
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