Co-developer Raven Software will deploy a new update for Call of Duty: Warzone on PC, PlayStation 4, PlayStation 5, Xbox One, and Xbox Series X|S soon that re-enables the recently removed XP tokens players were saving up. The patch notes are outlined below.
All XP tokens earned prior to the start of Season 1 are now usable in both Call of Duty: Modern Warfare and Warzone. However, any tokens acquired during Season 1 and beyond will only work in Call of Duty: Black Ops Cold War and Warzone. From this point forward, XP tokens–which are used to help players level up faster–can’t be used in Modern Warfare’s multiplayer.
Players were saving their XP tokens to level up the Black Ops Cold War weapons that just hit Warzone. This includes the Groza Assault Rifle and Mac-10 submachine gun.
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Source: Game Spot Mashup