Here are some possible reasons why you couldn't link your bank to your PayPal account:

• The account must be with a bank located in the same country as your PayPal account. In some countries, you can also use a U.S. bank account.
• The name on the bank account must match the name on the PayPal account.
• You can't link a bank account to more than 1 PayPal account at a time. Try removing the bank account  from the PayPal account it's currently linked to.
• The bank account has already been linked to 3 PayPal accounts in the past. You can't link a bank account to any more than 3 PayPal accounts over its lifetime.
• The bank account is already active on a PayPal account that has a limitation  or a balance below zero.
• The bank isn't compatible for use with PayPal. This may include most online-only or prepaid bank accounts.

If approved, you may be able to link the same bank account to a second PayPal account. You'll be informed when linking the bank if you've been approved.