The Black Ops 6 beta is experiencing some technical issues, causing crashes for many players.
To resolve these crashes, you can try restarting the game, using a wired internet connection, closing other internet-using devices, and verifying your game files.
If these steps don't work, the game may be overloaded due to the influx of players, but the developers are working on solutions.
Be patient, keep checking for updates and remember that the beta is a chance for the developers to identify and fix issues before the full release.