Ok I don't know if anyone else has been having this problem, but my fiancee has been playing for a while and she is level 27. She has been doing strikes and other things, but her Vanguard marks have stayed at 27 for almost a month. I checked a few forums and all I found was people who didn't have the correct items equipped or wasn't the right level. These are not the case for her, but never the less she is still not receiving any marks. Thanks for the help guys.
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The strikes need to be level 24 or higher
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Did you check to see if you are wearing any faction class items? If so, replace it with regular class items and you should be receiving Vanguard Marks again.