It's Payoneer's email.

I had the same problem.

The way Payoneer system works is very different from PayPal. The links between a Payoneer account and agencies seem to be rigid, complex, hard to edit.

I had to contact Payoneer via live chat to be able to talk with a human and got it fixed after a lot of email exchanges with different agents who, apparently, didn't work together and didn't know how to send the verification code to my Payoneer account page.

Once the issue with SS was fixed, my iS account that had been linked to the Payoneer account without problem started having broken link problem. I didn't want to go through the ordeal all over again. So I stopped using them.