Redirect after registration

We are using Gravity forms for our registration form for AffiliateWp, but once the form is completed, it keeps redirecting to a page that does not exist, no matter what we set the confirmation settings to.

The user registration is working, it is coming through to the AffiliateWP plugin but taking the users to a 404 page instead of where it is being told to take users once they have registered.

Please help, we have tried everything, even changing the page we would like to be used for the confirmation to match the URL it it taking the confirmation too but even that hasn’t worked.

Thankyou in advance.