Usually, you'd activate Windows 11 (or 10) using the Settings app to enter the product key. However, if you're in an enterprise environment and you have a specific type of activation key ...

At first, you'll notice a watermark badge at the bottom right with the message "Activate Windows. Go to Settings to activate ...

Go to Settings on Windows 10 or go to Cortana and Type ‘Settings’. Open the Settings and Click on Update and Security. On the right side of the Windows you will find a link ‘Activation’.