I've just made an update to the DataBridge v2 extension that will allow you to track the redirect without redirection. Then you can reference the redirect in the email after.
You would just update the authentication.php file to make sure you have v2.11 of that file (listed on the first line).
Then you can turn on the NoSuccessRedirect option (line 46).
After that your authentication server behavior will not redirect to the success page. You can then use the redirect in the email server behavior:
php:
<?php echo($Authenticate->Redirect); ?>
Did this help? Tips are appreciated...
