The link is an official Microsoft "short link" designed to simplify the connection between your Xbox console and your Microsoft account.
While the web link works perfectly, Microsoft often recommends using the (available on iOS and Android) for activation. aka ms activatexbox
After entering the code, your browser should say "Success" or "All Done." Within a few seconds, your Xbox console will automatically refresh and move to the next stage of the setup (usually involving system updates and personalization). Why Use the Xbox Mobile App Instead? The link is an official Microsoft "short link"