Bungie is fully aware of the Taken War Heroic Strike playlist not properly granting players their Legendary Marks, and they are currently investigating the issue. You can still spend your 3 weekly bonuses by playing Prison of Elders level 41. Sorry for the inconvenience! More Information about bugs introduced with Update 2.4.0 can be found here in this Bungie thread: https://www.bungie.net/en/Forum/Post/212588532/0/0