Hello @Shivam_Bailwal,
Welcome to PayPal Community Forum and Thank you for posting here!
I am sorry to know that you're unable to link your card and I understand that this can be concerning. It is possible that our security program considers a variety of factors at each transaction/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 case, you may try again at later time. Here's the Help Centre Article to know information. If the issue persist, please check the Resolution Center to see if there are any notification regarding your accounts status.
Regards,
Ayesha
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