slmgr /ato Some third-party tools claim to offer methods to activate Windows products without a key. However, be cautious : using such tools can pose significant risks to your system's security and stability. Tools like KMSpico, Windows Loader, and others are popular but can potentially contain malware or violate Microsoft's terms of service.
slmgr /ipk <eval_key> Replace <eval_key> with a valid evaluation key for Windows Server. For Windows Server 2022, a commonly used evaluation key is: How to activate Windows Server without product key