Suppress all notifications

Supported on: At least Windows Server 2016, Windows 10

Registry

HKLM Software\Policies\Microsoft\Windows Defender\UX Configuration

Value name: Notification_Suppress

Enabled: Notification_Suppress = 1

Disabled: Notification_Suppress = 0

Description

Use this policy setting to specify if you want Microsoft Defender Antivirus notifications to display on clients. If you disable or do not configure this setting, Microsoft Defender Antivirus notifications will display on clients. If you enable this setting, Microsoft Defender Antivirus notifications will not display on clients.