Getting Plesk default domain page and not your WordPress install ?

If you have uploaded the WordPress files to a new site and are still getting the Plesk Default domain display then you have probably forgotten to delete the old Plesk skeleton site especially the index.html file. By default a site will pick the index.html before index.php and so the WordPress index.php file is never read.

You should ideally delete all of the files in this httpdocs location before uploading and installing a new site.