Please try the following steps:
- Reset your Payoneer password;
- Wait 24 hours after your Payoneer was password reset;
- Log in first to Payoneer on the website using your new credentials; and
- Try and link your Payoneer account to your GCash account again
If the issue still persists, there might be something wrong with your Payoneer account. In this case, you can contact Payoneer’s Customer Care at firstname.lastname@example.org for them to assist you.