Call of Duty: Vanguard “not working” error message, explained

There are always a handful of issues for online games, and if you're playing Call of Duty: Vanguard, you may encounter some issues when trying to load a game online. Several players have reported experiencing the Call of Duty: Vanguard “not working” error message, with no further details on what's going on or what they can do to fix it. Here's what you need to know about the "not working" error message in Call of Duty: Vanguard and what you can do about it.

The first thing you will want to do is try to run another game of Call of Duty: Vanguard. Suppose the error repeats itself. Return to the Call of Duty main menu and select the Multiplayer option again. If you continue to have problems, please exit the application and restart it. Some players were able to restart the client to resume playing.

Alternatively, it could be a problem with your internet connection. First, make sure the Battle.net servers are still functioning properly, which you can check out on Activision's support page for Call of Duty: Vanguard. If everything looks fine, you'll want to check things out on your side by unplugging the router, waiting for the modem to reset, and then trying again. While waiting, close the Call of Duty: Vanguard application, then try again after re-enabling the Internet.

If you're still having trouble, the last thing you'll want to do is uninstall Call of Duty: Vanguard and see if a fresh reinstall is what you need to do. Complete reinstallation of all files may correct the error.

If you still encounter the problem, the next step is to escalate it and contact Activision's Support Team Page. You can contact them to explain the problem and see if they can find a solution for your computer. It might be something out of your hands that they can step in directly with and ensure the problem doesn't happen again, but talking to them is your final best bet, especially after a fresh install.