You may not have a compatible device. Call of Duty Warzone Mobile requires a device with at least 2GB of RAM and 3GB of storage space. You may not have the latest version of the Google Play Store app.
If you're signed in but having trouble connecting, check your system's status page for connectivity alerts, maintenances, or other factors indicating that servers are not fully operational. If there are issues with your system's servers, you might experience connectivity issues until they return to full operation.
Operating system explained\n\n Windows 10 is great for gaming, but if your game doesn't need to be on a Windows platform, you're free to choose another one. It's important to remember that you're likely to use this computer, including the OS, for other everyday tasks, so take that into consideration when you choose an OS.
They also create an easy way for parts of the computer such as the processor and graphics card to interact with each other. Mostly via driver software. This sort of interaction is crucial for a game to actually run. Without an actual OS system, your ability to run a game would be & well, very difficult.