Build 26220.8491 for the Windows 11 Insider Beta Channel is not listed in the provided context. The latest Beta build information available here is for build 26220.8474, released on May 15, 2026. That build:
- Is based on Windows 11, version 25H2 via an enablement package (KB5054156).
- Includes improvements such as:
- Reliability improvements for Simple Service Discovery Protocol (SSDP) notifications.
- Improved reliability when running
dism /online /cleanup-image /restorehealth. - A fix where File Explorer’s Properties did not invoke correctly for Recycle Bin and some other scenarios.
- Fluid Dictation for Spanish and French in voice access and Voice typing (Win+H), powered by on-device small language models.
- Has a known issue where “Reset this PC” can get stuck; the workaround is to use the cloud download option (Cloud PBR).
- Shows the usual Insider desktop watermark and carries the standard reminder that features may be experimental and not fully localized.
For details on which builds are in which Insider channels, Flight Hub can be used.
References:
- Windows 11 Insider Beta Preview Build 26220.8474
- Windows 11 Insider Beta Preview Build 26220.8283
- Windows 11 Insider Beta Preview Build 26220.8340
- Windows 11 Insider Beta Preview Build 26220.8370
- Release Notes for Beta Channel
- Update history for Office Beta Channel
- My system has been on RP channel why is it downloading a Beta release? - Microsoft Q&A
- Release Preview channel seems to be missing - Microsoft Q&A
- Problem updating to the latest preview insider channel build - Microsoft Q&A
- can you fix update 26220.8138 insider preview - Microsoft Q&A
- Build 26220.7070, WinRE still does not work with USB keyboard and mouse - Microsoft Q&A