On September 22, 2026, Microsoft released a preview cumulative update for Windows 11, version 25H2 and 24H2 (KB5124010) with certain known issues. According to the official Microsoft release notes for KB5124010 (OS Builds 26100.9550 and 26200.9550), there are two known issues currently acknowledged:
1. Domain-Joined Devices May Lose Trust Relationship
The affected devices with this bug include domain-joined devices protected by Credential Guard / Machine Identity Isolation and devices connected to on-premises Active Directory. The users may be unable to sign in with valid domain credentials. You may see error messages such as - The trust relationship between this workstation and the primary domain failed. The issue is linked to the Machine Identity Isolation feature enabled by recent updates beginning with KB5124008.2. USB Audio Class 1.0 Devices
This is a known issue with KB5124010 update where the audio output may stop working. The Device Manager may show: Code 10 error or This device cannot start error message to the users. Microsoft has listed this as an active known issue and is investigating.Should You Install KB5124010?
- Home users: For home users, it is safe to install this update on your PC if you want the latest preview features and fixes.
- Business/enterprise environments: Test carefully, especially if devices are:
- Domain-joined
- Using Credential Guard
- Managed through Intune or Active Directory
- Using legacy USB audio hardware.
