Assign a user Task to a group and everyone in the group has to complete that task

Hi Team,

i have a user task which has to complete by a set of Users in a group. i used MNI in other tab for the task and selected as shown below

but when i debug the flow its working same as group. i mean once a user is accepted this task. its completing. could you please help me in implementing  a user task which has to complete by a set of Users in a group(Everyone in the group have to compete the task )