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Find information on known issues and the status of the Windows 11, version 26H2 availability. For immediate help with Windows update issues, open the Get Help app if you are using a Windows device, or go to support.microsoft.com. Follow @WindowsUpdate on X for Windows release health updates. If you are an IT administrator and want to programmatically get information from this page, use the Windows Updates API in Microsoft Graph.
Current status as of September 29, 2026
Windows 11, version 26H2 has reached general availability. This new version contains all the recently announced features in Windows 11, versions 25H2 and 24H2 and will be delivered using servicing technology, providing a fast installation experience.
The rollout is phased and will expand over the next few months. Starting today, version 26H2 is available on eligible Windows 11, version 25H2 and version 24H2 devices for users who have turned on the setting Get the latest updates as soon as they’re available. If the update is ready for your device, it will download and install automatically, and a single restart will complete the process.
For more details on how to install Windows 11, version 26H2, watch this video.
Known issues
See open issues, content updated in the last 30 days, and information on safeguard holds. To find a specific issue, use the search function on your browser (CTRL + F for Microsoft Edge).
| Summary | Originating update | Status | Last updated |
|---|---|---|---|
| USB audio devices might fail to start or produce no sound Some USB Audio Class 1.0 devices display Code 10 or fail in multichannel audio modes after installing the Sept. 8 update | N/A | Mitigated | 2026-09-29 13:05 PT |
| Domain-joined devices might lose their secure trust relationship with the domain Some Credential Guard protected machine accounts might be unable to sign in interactively will valid domain credentials. | N/A | Mitigated | 2026-09-29 13:05 PT |
| Devices might experience a black screen or desktop loading issues after sign-in Microsoft has received reports of this issue occurring in some virtual desktop environments. | N/A | Mitigated | 2026-09-29 13:05 PT |
| Applications which require AC-3 audio decoding might close unexpectedly This issue is more likely to occur in legacy applications, and unlikely for many modern applications. | OS Build 26300.9550 KB5124010 2026-09-22 | Confirmed | 2026-10-02 15:41 PT |
Issue details
October 2026
Applications which require AC-3 audio decoding might close unexpectedly
| Status | Originating update | History |
|---|---|---|
| Confirmed | OS Build 26300.9550 KB5124010 2026-09-22 | Last updated: 2026-10-02, 15:41 PT Opened: 2026-10-02, 15:06 PT |
Following installation of Windows updates released September 22, 2026 (KB5124010), and later, some applications which require the decoding of AC-3 (Dolby Digital) audio might close unexpectedly.
Incidence of this issue depends on the activity that these applications perform. In some cases the application can fail to launch, or close without warning. In other cases the application will work normally until certain features are used, such as playing music. Affected applications may vary and can include games, media players, and certain productivity applications.
Please note that many modern applications do not use Windows for this type of encoding and therefore will not encounter this issue. The code component involved in this issue is most commonly used in legacy applications that still rely on Windows built-in audio decoding. Many modern applications using this legacy codec frequently include their own audio decoding components.
Next steps: We are working on releasing a resolution for this issue in a future Windows update. We will provide an update when more information is available.
Affected platforms:
- Client: Windows 11, version 26H2; Windows 11, version 25H2; Windows 11, version 24H2
- Server: None
September 2026
USB audio devices might fail to start or produce no sound
| Status | Originating update | History |
|---|---|---|
| Mitigated | N/A | Last updated: 2026-09-29, 13:05 PT Opened: 2026-09-11, 18:36 PT |
After installing Windows 11, version 26H2, some USB Audio Class 1.0 devices might fail to start or produce audio. Affected devices might experience one or more of the following symptoms:
- The device displays an error in Device Manager: "This device cannot start (Code 10).”
- No audio output.
- Volume controls are unresponsive or remain at zero.
- Sound settings are unresponsive or unavailable.
This issue is limited to USB Audio Class 1.0 devices.
Microsoft Support: IT administrators who need an immediate workaround for the symptoms not addressed yet by the OOB update should contact Microsoft Support for Business for assistance.
Next Steps: We are working to address this issue in a future Windows update and will provide more information when it is available.
Affected platforms:
- Client: Windows 11, version 26H2; Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10, version 21H2; Windows 10 Enterprise LTSC 2019; Windows 10 Enterprise LTSC 2016
- Server: Windows Server 2025; Windows Server 2022; Windows Server 2019; Windows Server 2016; Windows Server 2012 R2; Windows Server 2012
Domain-joined devices might lose their secure trust relationship with the domain
| Status | Originating update | History |
|---|---|---|
| Mitigated | N/A | Last updated: 2026-09-29, 13:05 PT Opened: 2026-09-16, 14:15 PT |
After installing Windows 11, version 26H2, some Credential Guard protected machine accounts might lose their secure channel with an on-premises Active Directory (AD) domain. Users might then be unable to sign in interactively with valid domain credentials and might receive a message stating that the trust relationship between the device and the domain failed. Offline sign-in using previously cached credentials might continue to work. AD replication and AD services on the domain controllers are not affected.
This issue occurs because Windows 11, version 26H2 enables the Machine Identity Isolation feature. While the update does not directly enable Machine Identity Isolation enforcement, it does cause Windows to begin honoring any existing or policy-provisioned settings that enabled Machine Identity Isolation enforcement. However, this feature is only supported for environments connected to domain controllers running at a Windows Server 2025 Domain Functional Level (DFL) and above. The feature should be disabled elsewhere. Any devices previously configured to use Machine Identity Isolation that are not connected to Windows Server 2025 domain controllers will experience this issue and will need to disable the feature.
Workaround: Important: This section contains information about modifying the registry. Before you modify the registry, back it up and make sure that you know how to restore it if a problem occurs. For more information, see How to back up and restore the registry in Windows.
To work around this issue, disable Machine Identity Isolation using the same management method that was used to enable it. Choose the applicable option below:
- If Machine Identity Isolation was enabled by Intune policy, disable Machine Identity Isolation with Intune.
- If Machine Identity Isolation was enabled by group policy, disable Machine Identity Isolation with group policy.
- If Machine Identity Isolation was enabled directly in the registry, use these steps to disable it:
- On the Windows 11, version 26H2 device, locate the following registry paths:
- HKLM\SYSTEM\CurrentControlSet\Control\Lsa\MachineIdentityIsolation
- HKLM\SOFTWARE\Policies\Microsoft\Windows\DeviceGuard\MachineIdentityIsolation
- For either of these registry keys, if the value for MachineIdentityIsolation = 2, then set MachineIdentityIsolation = 0.
After you disable Machine Identity Isolation, restart the device.
Then reset the secure channel using the following command:
'Test-ComputerSecureChannel -Repair -Credential (Get-Credential)'
Next Steps: We plan to resolve this issue in a future Windows update by temporarily preventing Machine Identity Isolation enforcement while improvements are made to the feature.
Affected platforms:
- Client: Windows 11, version 26H2; Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2
- Server: None
Devices might experience a black screen or desktop loading issues after sign-in
| Status | Originating update | History |
|---|---|---|
| Mitigated | N/A | Last updated: 2026-09-29, 13:05 PT Opened: 2026-09-24, 18:47 PT |
After installing Windows 11, version 26H2, and subsequent updates, some devices might experience desktop loading issues. This issue has been primarily observed on Azure Virtual Desktop (AVD) hosts, using FSLogix. This issue appears to occur more frequently with some existing user profiles.
Symptoms might include:
- A black screen appears after sign-in and the desktop session does not load automatically.
- Users might be unable to access their desktop until the desktop session is started manually.
- Application event logs might show Windows Explorer crashes.
Workaround: Affected customers can apply one of the following workarounds to mitigate the issue:
- Manually launch explorer.exe: Users can temporarily mitigate this issue by opening Task Manager (Ctrl+Shift+Esc), selecting Run new task, entering explorer.exe, and selecting OK.
- Mitigate through Known Issue Rollback (KIR): This issue is mitigated using Known Issue Rollback (KIR).
For enterprise-managed devices where Windows updates are managed by IT departments, IT administrators can apply the KIR by installing and configuring the Group policy listed below. The special Group Policy can be found in Computer Configuration > Administrative Templates > <Group Policy name listed below>
Group Policy downloads with Group Policy name:
- Download for Windows 11, version 26H1: KB5124006 260924_20071 Known Issue Rollback
- Download for Windows 11, version 26H2, Windows 11, version 25H2 and Windows 11, version 24H2: KB5124010 260924_20021 Known Issue Rollback
Important: You will need to install and configure the Group Policy for your version of Windows to resolve this issue. You will also need to restart your device(s) to apply the group policy setting. Note that this Group Policy will disable the change causing this issue until a resolution is released in a future Windows update.
For information on deploying and configuring this special Group Policy, please see How to use Group Policy to deploy a Known Issue Rollback
Next Steps: We are working on a resolution for this issue, and it will be released in a future Windows update.
Affected platforms:
- Client: Windows 11, version 26H2; Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2
- Server: None
Report a problem with Windows updates
To report an issue to Microsoft at any time, use the Feedback Hub app. To learn more, see Send feedback to Microsoft with the Feedback Hub app.
Need help with Windows updates?
Search, browse, or ask a question on the Microsoft Support Community. If you are an IT pro supporting an organization, visit Windows release health on the Microsoft 365 admin center for additional details.
For direct help with your home PC, use the Get Help app in Windows or contact Microsoft Support. Organizations can request immediate support through Support for business.
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