It's required to enable apache module(mod_php) for PHP shipped with Plesk.
How to do it?
mod_php is not included to PHP shipped with Plesk. Apache doesn’t allow multiple versions of PHP using
mod_php can be enabled only for OS PHP.
mod_php for OS PHP check Apache handler is not available in Plesk article.
Note: Enabling the
mod_php Apache handler is not safe as it is outdated and insecure.