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I cannot seem to get any more Legendary marks.
The Legendary mark inventory cap is 200. Once you reach this cap, you will not gain additional marks.
Be sure to spend your marks on gear to make room for new marks.
You can view owned Legendary marks in the Character Inventory screen, located next to the Glimmer count.
Please note: Legendary Marks are shared account-wide. This includes the 200 limitation.