The primary culprit behind this issue is either a , which the game relies on to initialize its multi-channel audio tracks. Below is a comprehensive guide to understanding why this happens and how to completely resolve the error. Anatomy of the "MSS Init Failed 150" Error
Use the launcher to re-download only the multiplayer or base game components. Call of duty exe err mss init failed 150
If you are a streamer or use voice changers (Voicemod, VB-Cable, Nvidia Broadcast Audio), uninstall them temporarily. The primary culprit behind this issue is either