Policy
Specify contact phone number or Skype ID
Specify the phone number or Skype ID that will be displayed in Windows Security and associated notifications. Users can click on the contact information to automatically call the supplied number. Skype will be used to initiate the call. Enabled: Enter the phone number or Skype ID in the Options section. Disabled: A contact phone number or Skype ID will not be shown in either Windows Security or any notifications it creates. Not configured: Same as Disabled.
19053dce5e3f EnterpriseCustomization_Phone Registry
Copy registry mappings
HKLM\SOFTWARE\Policies\Microsoft\Windows Defender Security Center\Enterprise Customization\PhonePolicy notes
Specify the phone number or Skype ID that will be displayed in Windows Security and associated notifications. Users can click on the contact information to automatically call the supplied number. Skype will be used to initiate the call. Enabled: Enter the phone number or Skype ID in the Options section. Disabled: A contact phone number or Skype ID will not be shown in either Windows Security or any notifications it creates. Not configured: Same as Disabled.