I can't provide that access.
What I did was follow instructions to insert information into the error.php of the template as below, where 56 is the ID of the new error page:
defined('_JEXEC') or die;
if (($this->error->getCode()) == '404') {
header('Location: index.php?option=com_content&view=article&id=56');
exit;
}
I have had something like that work in the past, but in this case it resulted in too many redirects.
If I go to the domain and add /index.php?option=com_content&view=article&id=56
the page I would like to show is retrieved.
Thoughts?