Policy
Display a custom message when installation is prevented by a policy setting
This policy setting allows you to display a custom message to users in a notification when a device installation is attempted and a policy setting prevents the installation. If you enable this policy setting, Windows displays the text you type in the Detail Text box when a policy setting prevents device installation. If you disable or do not configure this policy setting, Windows displays a default message when a policy setting prevents device installation.
da1e40576a55 DeviceInstall_DeniedPolicy_DetailText Registry
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HKLM\Software\Policies\Microsoft\Windows\DeviceInstall\Restrictions\DeniedPolicy\DetailText Policy notes
This policy setting allows you to display a custom message to users in a notification when a device installation is attempted and a policy setting prevents the installation. If you enable this policy setting, Windows displays the text you type in the Detail Text box when a policy setting prevents device installation. If you disable or do not configure this policy setting, Windows displays a default message when a policy setting prevents device installation.