Completed the heroic story mission but it did not give me any legendary marks, and still shows up as uncompleted in my directory. I didn't leave before the end of mission screen.
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My issue is resolved. For some odd reason, selecting the heroic story mission gave me the 'Enemy of My Enemy' mission, when in reality the mission of the day was 'Outbound Signal', I got the legendary marls after completing that mission. I have no idea at all why it gave me the wrong mission, all I know is that when I looked in my directory after playing the first mission it did a little animation like the ones you would see after weekly reset, indicating that there are new activities to complete.