Hi,
The sub-domain blacklist is actually for domains like support.domain.com, products.domain.com. What you are looking to do is prevent a file under a sub-folder. In this case you will need to use javascript.
e.g.
$(‘a[href*=“signup.php”]’).attr(‘href’, ‘http://www.domain.com/signup.php?fullweb=1’);
The above example forces the http://www.domain.com/signup.php link to the desktop verson via the ?fullweb=1 addendum. The first part of the script indicates the refernces URL sub-folder path (signup.php). You will just need to format the script as below.
The code is placed via the online tools under Advanced >> Javascript >> Internal Scripts section.
Kind regards,