GPO setting "Relax minimum password length limits" is not showing in GPOADmin when trying to edit a GPO.
The “Relax minimum password length limits” Group Policy setting is not available by default in Windows Server 2016 or 2019.
Windows Server 2022 and later: The setting is included by default.
Windows Server 2016/2019: The setting can be made available by updating the ADMX templates.
For the setting to appear in GPOADmin:
The GPOADmin server must be running Windows Server 2022.
It must query a preferred domain controller that is also running Windows Server 2022 where the setting is available.
If the ADMX templates are updated, it may be possible for a GPOADmin server and DC running Windows Server 2016 or 2019 to expose the option. However, this configuration has not been tested.