Now you can assign users email signatures to Active Directory groups. This is one more type of filtering that allows you to assign certain signatures to users groups, taking the values of the groups directly from the Active Directory.
In Email settings (1) select the signature that should be displayed for a cerain user group and click Edit (2).
Choose filter type and select filter values
Select Active Directory Group (3) and select a group from the dropdown if available (4) or insert the number of the group manually as comma separated values.
(If you use AzureAD you AD groups will be available on a dropdown. If you use ADFS/SAML2 the AD group must be typed in manually)
Remember to Save your changes!