Your network contains an Active Directory Domain Services (AD DS) domain. All domain members have Microsoft Defender Credential Guard with UEFI lock configured. In the domain, you deploy a server name

The Device Guard and Credential Guard hardware readiness tool is used to check compatibility and status, not to disable the feature or override Group Policy enforcement.

With Credential Guard enforced by Group Policy with UEFI lock, merely disabling it locally on Server1 is insufficient as the Group Policy will reapply it upon system restart or policy refresh. To truly ensure Server1 is not subject to Credential Guard restrictions, the "Turn on Virtualization Based Security" Group Policy setting, which enables Credential Guard, must be disabled for Server1 or the organizational unit it resides in. This prevents the policy from re-enabling the feature.

Using `dism /Disable-Feature /FeatureName:IsolatedUserMode` might disable some components locally, but it does not override a Group Policy that enforces Credential Guard with UEFI lock. The Group Policy must be addressed directly to remove the enforcement.