I open this again because the original from "anonymous" is closed.

When creating an additional admin user it is not possible to add or remove Fail2ban to the option of that user.

Is it possible to add such functionality in Plesk from the restricted mode?

So, as @IgorG need more info, here is it:
The guy are refering that when you create a new plesk admin account, and you check the mark to be "Enabled Restricted Mode" this account cannot see nothing about Fail2Ban. So, when you go to yourserver:8443/admin/server/admin-plan you cannot choose to enable "Fail2Ban" management. So, these restricted admin accounts, cannot manage Fail2Ban never. But, as the original guy, I want to.

https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/40624339-add-remove-fail2ban-for-additional-administrator-a#{toggle_previous_statuses}

Currently, additional admins can be limited only by the actions they can perform. They have either access to one subscription (when created as subscription user), or to all subscriptions on the server (when created as additional admin). That is unworkable for agencies, where you have different developers or account managers having to work on more than one subscriptions, but when you don't necessarily want to give all team members access to everything all of the time.

There is a simple solution: allow the admin to use restricted mode to select a limited set of subscriptions that different team members have access to, so that developers or account managers can access the subscriptions that are relevant to them, without having to grant the entire team access to each and every account on the server.

We already have several settings that can be added to the Plesk in Restricted Mode. It can be applied in Tools & Settings > Restricted Mode Settings. But enabling some functionality can enable alongside the unwanted functionality.

Example: The goal is to enable only "IP Address Banning (Fail2Ban)".
It can be done by turning on "Server settings" in Tools & Settings > Restricted Mode Settings > Administrative Tools > General. However, this will enable the following functionality as well:
- IP Address Banning (Fail2Ban)
- Web Application Firewall (ModSecurity)
- Restrict Creation of Subzones
- Prohibited Domain Names
- Server Settings
- Customize Plesk URL
- Server Statistics Settings

Which is not required in scale to turn on only "IP Address Banning (Fail2Ban)".
Please add the fine-tuning for Restricted Mode to be able to add and remove functionality one by one.