Microsoft rolls out Windows 11 Insider Preview Build 27863 to Canary Channel

Microsoft released Windows 11 Insider Preview Build 27863 to the Canary Channel on May 23, 2025. The release introduced support for the post-quantum signature algorithm ML-DSA in the NCrypt and BCrypt cryptography API surfaces and the Crypt32 certificate APIs. It also includes various fixes to improve system stability and performance.

This build supports three variants: ML-DSA 44, 65, and 87. With these improvements, users running Build 27858 or higher can test and validate ML-DSA certificates.

Here is the entire changelog of the build:

Fixes

[Windows Sandbox]

• Fixed an issue causing Windows Sandbox to not work and show error 0xc0370106 on launch in the previous flight.

[Other]

• Fixed an issue where core Windows surfaces were not able to load in safe mode (File Explorer, Start menu, and others) after the previous flight.
• Fixed an issue with msftedit.dll which was causing apps like Sticky Notes and Dxdiag to crash in certain cases for people using Hebrew or Arabic display languages.

Known issues

[General]

• [IMPORTANT NOTE FOR COPILOT+ PCs] If you are joining the Canary Channel on a new Copilot+ PC from the Dev Channel, Release Preview Channel or retail, you will lose Windows Hello pin and biometrics to sign into your PC with error 0xd0000225 and error message “Something went wrong, and your PIN isn’t available”. You should be able to re-create your PIN by clicking “Set up my PIN”.
• You may see an Administrative Templates error message when opening Group Policy Editor. If you click OK you should be able to proceed as normal. One of the causes of this is fixed with this flight – there’s a second fix we’re working on which will be included in an upcoming flight.
• We’re investigating an issue where the taskbar is unexpectedly not showing acrylic material after upgrading to this build.
• We’re working on the fix for an issue where audio devices with high sampling (like 192Hz) and multiple channels aren’t producing sound after upgrading to this build. Thanks Insiders that provided detailed information in your feedback!

[Input]

• Pen input may be non-responsive on some PCs that support pen for inking.

[Task Manager]

• Search and other options such as filtering in Task Manager does not work.

For more information on Windows 11 Insider Preview Build 27863, refer to the support article on the official Windows blog.

If you wish to try a new feature before it becomes public and join the Windows 11 Canary channel, you must enroll in the Windows Insider Program and choose the Canary channel. 

However, if you are already an Insider and want to switch from a different channel, like Dev or Release Preview, to Canary, you need to do a clean installation of Windows 11.