eBay has transitioned away from Paypal as there method of payment to sellers and now requires sellers to sign up for Managed Payments.
Information about Managed Payments can be found here:
https://pages.ebay.com/seller-center/service-and-payments/managed-payments-on-ebay.html
and here:
https://www.ebay.com/help/selling/getting-paid/introducing-managed-payments-ebay?id=4795&ebay-mobile-status=done
Here is a direct sign up link: https://ebaypayonboardingweb.ebay.com/validate-user
Once you go through the sign up flow and validate your identity and bank account information then you will see a success message like this:
