Are you working on an event that is using the Registration platform, Evento? If so, you will need to ensure that Evento places the following script on the page not the iframe of the page which houses the Activator (formally Login) Widget.
The Activator Widget is installed in an iframe, the custom script is installed on the page.
Evento Redirect JavaScript:
https://s3.amazonaws.com/cdn-
Once this is done, InGo controls the manual redirect param from admin.