FYI. I posted in this thread just now since it seems to be of similar issues to this one: Call of Duty *NEW patch 4/22/2021* - Won't launch - #370 by Quantum3-11267
Essentially, the game just “magically” started working & launching correctly again. 
FYI. I posted in this thread just now since it seems to be of similar issues to this one: Call of Duty *NEW patch 4/22/2021* - Won't launch - #370 by Quantum3-11267
Essentially, the game just “magically” started working & launching correctly again.