The Update BureauWindows 11, version 26H1 · Release Health
Known issues in Windows 11, version 26H1
Problems Microsoft has confirmed for this version, from its official release health notes. 2 still open or mitigated.
Active known issues
Open & Mitigated-
Microsoft Office applications might fail to open from certain third-party apps
Some third-party apps might fail to open Office apps or documents. Microsoft lists this issue for Windows updates released on or after June 9, 2026.
How to apply the workaround WorkaroundInstall a later Windows update; Microsoft says updates released on or after July 14, 2026 address this issue.
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Warnings related to Remote Desktop might not display correctly
Remote Desktop security warnings might show overlapping text or partly hidden buttons when monitors use different display scaling settings.
Workaround status No workaround yetMicrosoft has not published a manual workaround for this issue yet. Defer KB5082052 on affected systems until a fix is released.
Recently resolved
Fixed in latest updates-
USB audio devices might fail to start or produce no sound
Some USB Audio Class 1.0 devices might fail to start or produce no sound. The 8-channel and 3D audio symptoms are resolved by KB5129194; KB5132059 and later updates resolve the remaining symptoms.
How to apply the workaround WorkaroundSome customers reported restoring audio in multichannel cases by switching to 2-channel mode.
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Remote Desktop connections might fail for non-admin users with error 0xC000000D
Non-admin users might fail to connect to Remote Desktop hosts with Administrator protection enabled, seeing error 0xC000000D. KB5127653, released October 27, 2026, resolves this issue.
How to apply the workaround Group Policy / IntuneOn affected devices using an update from before October 27, 2026, temporarily turn off Administrator protection by resetting the User Account Control Type Of Admin Approval Mode policy in Intune or Group Policy.
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File History might stop working after installing September 2026 Windows update
Some File History users might be unable to create or update backups, even when a working backup drive is connected. Updates released on or after September 22, 2026, such as KB5124006, resolve this issue.
Resolution Fixed in KB5126653Install KB5126653 (or a later cumulative update) on affected devices. No manual workaround is required after updating.
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Devices might experience a black screen or desktop loading issues after sign-in
Some devices, primarily Azure Virtual Desktop hosts using FSLogix, might show a black screen after sign-in or fail to load the desktop automatically. This issue is resolved by updates released October 13, 2026, including KB5127648.
How to apply the workaround Group PolicyBefore installing the resolving update, users can start Explorer manually; enterprise IT can mitigate the issue with Known Issue Rollback and a restart.
Step-by-step workaround instructionsShow steps Hide steps2 stepsStep-by-step procedure- To temporarily start the desktop, open Task Manager, select Run new task, enter
explorer.exe, and select OK. - For enterprise-managed devices, install and configure the applicable Known Issue Rollback Group Policy, then restart the devices.
- To temporarily start the desktop, open Task Manager, select Run new task, enter
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Domain-joined devices might lose their secure trust relationship with the domain
Some Credential Guard protected machine accounts might lose their secure connection to an on-premises domain, blocking interactive sign-in. KB5124006 and later updates resolve this issue.
How to apply the workaround Group Policy / IntuneThe rollback or disabling Machine Identity Isolation stops its enforcement, which prevents the affected domain trust problem. The rollback policy must be set to Disabled, and the device must be restarted.
Step-by-step instructions, command & download kitShow steps & kit Hide steps & kit4 steps powershell.exe · Administrator Power-User Kit (.zip)Step-by-step procedure- For the rollback option, install the special Group Policy for Windows 11, version 26H1, set its KB5124012 rollback policy to Disabled, and restart the devices.
- Alternatively, disable Machine Identity Isolation using the same method that enabled it: Intune policy, Group Policy, or the registry.
- If using the registry, check either listed key. Change
MachineIdentityIsolationfrom 2 to 0 only when its current value is 2. - Restart the device, then repair the secure channel with the PowerShell command.
> Test-ComputerSecureChannel -Repair -Credential (Get-Credential) -
Remote Desktop Services might stop responding after September 2026 security update
Some organizations might see Remote Desktop connections fail, sign-in problems, or unresponsive tools and servers. Updates released on or after September 14, 2026, such as KB5129194, resolve this issue. Windows 365 and Azure Virtual Desktop are not affected.
Resolution Fixed in KB5129194Install KB5129194 (or a later cumulative update) on affected devices. No manual workaround is required after updating.
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Host folder shares might be unavailable in Hyper-V-based Linux VMs
Host folders shared with some Linux virtual machines might not appear or open. Updates released on or after September 14, 2026, such as KB5129194, resolve this issue.
Resolution Fixed in KB5129194Install KB5129194 (or a later cumulative update) on affected devices. No manual workaround is required after updating.
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Microsoft Teams and Outlook might fail to launch on ARM-based devices
On ARM-based PCs, Teams and the new Outlook might fail to start or close unexpectedly, especially on new PCs without Store updates. Windows updates from September 8, 2026, such as KB5124012, resolve this.
How to apply the workaround WorkaroundInstall version 1.0.19.0 or later of the Auto Super Resolution Package from Microsoft Store. This is a workaround; Windows updates from September 8, 2026, such as KB5124012, resolve the issue.
Step-by-step workaround instructionsShow steps Hide steps3 stepsStep-by-step procedure- Open Microsoft Store.
- Select Downloads > Check for updates.
- Install the latest update for the Auto Super Resolution Package, version 1.0.19.0 or later.
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Deleting from Recycle Bin displays an internal file name
When you permanently delete one item, the confirmation box might show an internal file name instead of the original. Microsoft lists this issue for this update.
How to apply the workaround WorkaroundInstall KB5095093, which Microsoft says addresses this issue.
No known issue matches these filters.