BREAKING: Multiplayer is NOT coming to MW2 Remastered. Instead, Activision plans to add "more classic map experiences  to Modern Warfare.

Firstly, open Steam and select MW2 from your games library. Then, click on Properties, followed by Local Files, and finally, click on the Verify Integrity of Game Files &  option. Steam will then automatically check for updates and update your game files to the most recent version available.

COD Mobile like most first-person shooters on consoles and PC requires that your ping is below a certain threshold for it to be able to connect you to a game properly. If your ping is too high then it will simply not connect and will display the error "Unable to connect to game".

Here are some possible solutions: Check server status: Before troubleshooting, it's important to check the server status of Warzone to ensure that the issue is not due to server maintenance or a server outage. Restart your device: Try restarting your computer or gaming console and then launching Warzone again.