unable to associate this funding source with your existing account

That connecting just you need you refresh the tab....then see it's connected...if that Payoneer is not connected with other contributer account 

Contact Payoneer to confirm that your account can accept royalty payments from Adobe. 

In some regions, you may need a business account.

What is your question? If you are unable to attach your Payoneer account, use the Contact Us link to reach out to Adobe Stock Contributor Support directly. Your fellow Contributors here in this forum are not going to be able to help with such an issue.