Why am I not able to delete Groups in USM?

Document ID : KB000011888
Last Modified Date : 14/02/2018
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Introduction:

Some groups do not appear to be delete-able when you click on the group and then the Action button in the upper right corner of the USM screen.

'Delete Group' is greyed out.

Question:

Why am I not able to delete Groups in USM?

Environment:
All
Answer:

The un-deletable groups are Automatically Created Groups. 
To delete these groups - 

1. Click on the USM Administration button (the Pencil) and select the 'Configure Automatic Groups' Tab 

2. De-select (un-check) the groups you wish to delete 

3. Make sure to hit the Save button after the changes are made 

4. Close the window 

Now the Automatically Created Groups will have 0 elements 
They can now be deleted manually using the 'Action' button in the upper right corner - Delete group