cmd window blink fast. It mean you didn't run it as administrator (required).
Edit bat file Properties > advanced and there is option to set "run as administrator". Mine system is in polish language, but you will find it's simple :)
Everytime you run this bat file, window should will ask you to confirm to run this bat file. This mean all is correct.
This bat will not work only in once case. When you update meta app then one additional process is spawn which is not included (I'll catch it next time and add info here). But after windows reboot all will back to "normal".
As bonus, you can add to bat file this line to kill EA service too. Their app do same as meta:
net stop EABackgroundService
