Removing a user from a Distribution List (DL) who has been disabled and hidden from the GAL

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Log in to Outlook Web Access (https://outlook.office.com) using your OUHSC account information
Click People on the left hand side. You will see “Groups” on the left side, including those of which you are a member or owner. Note you have to be an owner to be able to modify the group.
Select the group you wish to modify > Click Members.
You will be able to Add and/or Remove users from the membership list by clicking the X "Remove from group" button to the right of their name.