From what i know, this error occurs when the Destiny 2 game files have been corrupted and need to be repaired or verified.
I reinstalled the game on Steam 12 plus times after trying over 20 game verifications.
Each time i either get to the patching screen and it crashes, or the game launches and i crash upon moving around in game.
Ive even went as far as to installing a new version of windows.
Not too sure where to go from here.
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I have having the same issue on Xbox. I have been getting constant marmot error codes since this morning. I can play in activities solo but I cannot load in to matchmade activities.