Redirect For Premium Plugin Failing

When user registers data is passed to gotowebinar without issue, but the redirect doesn’t function properly.  It just stays on the registration page, but the page goes blank.  This wasn’t an issue with the free version.
can you provide some clarification regarding the proper method to redirect registrants to the confirmation page after registration?  Obviously the “pageid” value from the free plugin doesn’t function with the premium version shortcode.