Windows Server 2022 Add workstations to domain user right must only be assigned to the Administrators group on domain controllers.
Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities.
Accounts with the "Add workstations to domain" right may add computers to a domain. This could result in unapproved or incorrectly configured systems being added to a domain.
How this relates to the STIG checklist: STIG vs SCAP benchmark.