Hi @scanlinejay,
It seems like you are using ModernWarfare.exe with improper settings to run Warzone. Please make sure you unchecked “Disable fullscreen optimization” in the shortcut settings (you can find the instruction on this page: [Troubleshooting] How to fix live tracking issues).
This is how you can find the file on your PC:
C:\Program Files (x86)\Call of Duty Modern Warfare\ModernWarfare.exe