Hi @saint ,

Since you have users from both groups, you just need to find the common ones between the two lists.
Add a Script step in your subflow and use logic like this:

var commonUsers = [];

for (var i = 0; i < inputs.group1_users.length; i++) {
if (inputs.group2_users.indexOf(inputs.group1_users[i]) > -1) {
commonUsers.push(inputs.group1_users[i]);
}
}

outputs.common_users = commonUsers;
Takes users from Group 1, Checks if they also exist in Group 2
If yes → adds them to output, So you’ll get only common members