The #TYPO3 extension ns_helpdesk v14.0.0 is now compatible with TYPO3 v14.
https://extensions.typo3.org/extension/ns_helpdesk
TYPO3 Helpdesk Extension (ns_helpdesk)

Easily manage customer support on your TYPO3 site with a ticket-based helpdesk system. Includes dashboard, ticket management, email alerts, file uploads, and user access control.