Creating a subdomain fails:
Error: Unable to create a domain: there are no available PHP handlers
This is Plesk bug with ID #PPPM-6335 which will be fixed in future updates.
As a workaround:
1. Download a custom fix: Availability.php
2. Back up original file from
"%plesk-dir%"\admin\plib\Hosting\Options and replace it with the fix
If PHP Settings for domains are visible and it is not possible to customize subscription without any PHP handlers installed, check this article: PHP Settings button is available while no PHP handlers installed on a server