Home computer firewalls may also prevent you from accessing your Vanguard accounts online. You may want to consider disabling your firewall temporarily. Other steps you can take: Enable cookies on your browser and/or disable any programs on your computer that block cookies.

Make sure your video card drivers are up to date, and your PC meets the minimum requirements to play Call of Duty: Vanguard. Workaround: Shut down any applications running in the background while playing the game.