You should now be able to manage Active Directory objects using ADUC on your Windows 11 machine.
Alternatively, you can also install ADUC using PowerShell:
: You must have Windows 11 Pro, Enterprise, or Education . Windows 11 Home does not support domain-joining or RSAT.
On the left sidebar, click (or Apps in some versions). Select Optional features from the right-hand list.
This is the most common way to enable ADUC using the standard Windows 11 interface.