This will be effective in those situations where you get the error at the initial start screen.

Launcher issues – As some affected users have reported, you might be able to bypass this error entirely by opening the game directly from the main executable of the game instead of from Battle.Net.Some users that were also dealing with this issue have confirmed that the problem was fixed after they forcibly closed the app via Task Manager (while the game was opened). Battle.Net glitch – Another potential scenario that might cause this type of error is a glitch affecting the main launcher that you use to open the game (Battle.Net).To fix this issue, you’ll simply need to log out of the Battle.Net app and log in again before restarting the game. This typically during prolonged periods spent in the game lobby. Expired Battle.Net Login token – As it turns out, one of the most common causes that might be responsible for this issue is an expired Battle.Net login token that the game expects.To fix this issue, you’ll need to force admin privileges on both the game and the game launcher (if necessary). Without admin access, the connection with the game server will likely not be established. Missing admin access – Depending on your UAC (User Account Control) settings, you can also experience this error due to the fact that the game (or the game launcher) doesn’t have admin access.To fix it, open Battle.Net and adjust the region to the correct one. This might be the reason why you’re experiencing the error. The incorrect region is selected – Since Warzone is a game that uses dedicated servers to facilitate online matchmaking, it’s important to select the correct region inside.Battle.Net is sketchy when it comes to forcing the latest available game version when you cross-launch, so you might need to do it manually. Warzone is not updated – When you start troubleshooting this issue, the first thing you should do is ensure that Call of Duty Modern Warfare or Call of Duty Vanguard is updated with the latest version available.

Battle net cod mw