Microsoft has accidentally offered the Windows 11 upgrade to computers with hardware that doesn’t meet the minimum requirements for the latest operating system. Twitter user PhantomOcean3 brought the issue to light earlier this week when they noticed that Microsoft was displaying full-screen prompts on unsupported hardware.

According to a support note from Microsoft, “some hardware ineligible Windows 10 and Windows 11, version 21H2 devices were offered an inaccurate upgrade to Windows 11. These ineligible devices did not meet the minimum requirements to run Windows 11. Devices that experienced this issue were not able to complete the upgrade installation process.”

Last year, Microsoft had a similar issue when it offered the Windows 11 upgrade to PCs that weren’t officially supported. However, that accident allowed unsupported PCs to upgrade, thereby highlighting the controversial minimum hardware requirements for Windows 11.

Microsoft officially requires Intel 8th Gen Coffee Lake or Zen 2 CPUs and up, with very few exceptions, for Windows 11. Although there are easy ways to install Windows 11 on unsupported CPUs, Microsoft has been testing a new desktop watermark on such hardware.

This latest mistake comes just weeks before Microsoft is expected to release some additional improvements to Windows 11, internally referred to as “Moment 2.” These improvements will include a full search box on the taskbar, improved search in the Start menu, a tablet-optimized taskbar, and a redesigned system tray.