When installing Windows 11 and you reach the screen asking, "Let's connect you to a network," you can use the Shift+F10 keyboard combination to open a Windows command prompt.
At this prompt, type start ms-cxh:localonly and press Enter on your keyboard to open a "Microsoft account" window where you can create a new local user for the Windows 11 install.
After filling in the information and clicking the Next button, the Windows 11 setup will continue. However, now it will continue using your created local account and will not prompt you to use a Microsoft Account.