User Configuration > Administrative Templates > Microsoft Outlook 2016 > Outlook Options > Other
User
HKCU\software\policies\microsoft\office\16.0\outlook\options\general
This policy setting determines if tenant admins can receive support notifications in Outlook. Default (0): Tenant admins who are signed in will receive status updates about potential issues and fixes that are impacting their tenant. If you enable this setting, tenant admins who are signed in won't receive status updates about potential issues and fixes that are impacting their tenant.