To remove the safeguard hold on your device, you will need to update to VirtualBox 6.1.28 or a later version. Oracle has resolved this issue in VirtualBox 6.1.28 and later versions. If you no longer use VirtualBox, uninstalling it should also mitigate the safeguard. Please note, if there are no other safeguards that affect your device, it can take up to 48 hours before the upgrade to Windows 11 is offered. You can check Oracle's progress by monitoring their ticket #20536. To mitigate the safeguard, you have to remove Hyper-V or Windows Hypervisor temporarily until this issue is fixed with an update Oracle plans to release in October 2021.

To safeguard your upgrade experience, we have applied a compatibility hold on these devices from installing or being offered Windows 11. When Hyper-V or Windows Hypervisor is installed, you might be unable to start virtual machines (VMs) and you might receive the message. Microsoft and Oracle have found a compatibility issue between VirtualBox and Windows 11. Click Learn More for information on how to update this app. Your PC requires the latest version of this app. When you try to upgrade to Windows 11, you might encounter an upgrade compatibility hold and receive the following message:

KB5007125: Compatibility hold when you upgrade to Windows 11 with Oracle VirtualBox installed Symptoms

Installer windows 11 virtualbox