This is the most successful general fix.
Navigate to the game's .exe file (usually in Program Files (x86)\Call of Duty\_retail_ ), right-click it, go to Properties > Compatibility , and check Run this program as an administrator . How to fix Warzone 2 Crashing & Not Launching (...
Right-click Call of Duty in your Library > Properties > Installed Files > Verify integrity of game files . This is the most successful general fix