Windows 11 build 21990

Windows 11 build 21990 is an unleaked build of Windows 11. A screenshot of this build was posted on the "Inside Windows" Telegram by Zac Bowden, showing the search bar with "Windows Security" highlighted as an option. It was also mentioned along with build 22117 in a Feedback Hub guide video posted by the Windows Insider Program channel on YouTube.

This build features a "Do not take screenshots of this build" watermark and a build hash in the bottom-left corner of the screen, in a similar fashion to the Microsoft Condfidential watermark featured in builds of Windows 8 up until build 11065 of the Windows 10 Anniversary Update.