1- group should exist in EEM then configure group name in Assign User Task
2- if group is not in EEM or is a SDM group
a- get group name and use SOAP or use select object operator to get group members name, email and user id, then use the userid attribute in Assign user task operator
two ways,
1- group should exist in EEM then configure group name in Assign User Task
2- if group is not in EEM or is a SDM group
a- get group name and use SOAP or use select object operator to get group members name, email and user id, then use the userid attribute in Assign user task operator