Hello @Alexin01,
Welcome to PayPal Community Forum and thank you for posting!
I am sorry to know that you're having issues while linking your card to PayPal account. PayPal's Security System monitors and detects many different factors to keep the network as secure as possible. While we recognize that this can be a frustrating experience for you, this security system helps uphold the safety and integrity of the PayPal community overall. To go about this problem, I would recommend you to try some troubleshooting such as clearing cache and cookies or try using different browser or device. If the issue still persists, try adding a different card to see if that works. Here's the Help Center Article to know why you can't link your card. Apologize for any trouble caused.
Regards,
Ayesha
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