Fig 1: Azure AD licenses tabSelect assign from the tray (or navigate into the license type) and set the view filter to group (all groups)
Fig 2: User selection for license assignmentSelect the groups that you want to assign and confirm the selection (click "Assign").
Fig 3: ConfirmationThe group will be marked for automated assignment and its members will be assigned independently in the background. A few details (the fine print):
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.