I was just writing up a post to find out if anyone else was not getting their Legendary Marks when completing it, but I just noticed the Bungie Help Twitter account has already posted about the issue.

Not really sure if it's affecting everyone or just some players.

I was just writing up a post to find out if anyone else was not getting their Legendary Marks when completing it, but I just noticed the Bungie Help Twitter account has already posted about the issue.

Not really sure if it's affecting everyone or just some players.

Affected me. Completed the mission and not only no marks, but the activity shows as not completed in the Director.

Yup. And if I went to select the mission again, it still showed that the 15 mark reward was available, as if I had never completed it.