Hello Manoj Rajan
Based on the error code you shared (0xC004F069), this typically occurs when the key you're using isn't compatible with the edition of Windows Server installed on your machine. For example, trying to activate a Standard edition key on a Datacenter edition install can trigger this issue.
To resolve it, please double-check that your product key matches the exact edition of Windows Server installed. You can confirm your edition by running winver or checking under Settings > System > About. If the key is correct but the issue persists, you may need to use the Software Licensing User Interface (SLUI) tool. Run the command slui.exe 0x2a 0xC004F069 from the Run dialog (Win + R) to get more details and guided steps.
If this answer helps, please hit “Accept Answer” so we know you’re all set 🙂.
Harry.