No PGP for Horde Mail in Plesk

When checking mail, I noticed the PGP option was not available. It should look like this:

So, I followed this:
https://support.plesk.com/hc/en-us/articles/115002313594-How-to-install-GnuPG-PHP-extension-for-Plesk-PHP-

But still missing.

How To Install and Use GPG Encryption In Linux In Order To Encrypt and Decrypt Files and Folder?

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