Call of Duty: Black Ops 6 multiplayer woes: Fixing the "Join Failed" Error
Call of Duty: Black Ops 6 has arrived, but not without its glitches. A frustrating issue preventing players from joining friends is the "Join Failed Because You Are on a Different Version" error. Here's how to resolve it.

This error usually means your game needs updating. Returning to the main menu and checking for updates should, in theory, solve the problem. However, many players report this doesn't always work immediately.
The next step is a simple game restart. This forces a fresh update check. While you'll lose a few minutes, it's a quick fix that often resolves the issue. Just let your friends know you're restarting.
Related: How To Get the Dragon’s Breath Shotgun Attachment in Black Ops 6 (BO6)
If the error persists after restarting, try this workaround: When the error appeared during my own troubleshooting, searching for a match allowed my friend to join my party after a few attempts. It's not ideal, but it's a better alternative than abandoning the gaming session.
That's how to tackle the "Join Failed Because You Are on a Different Version" error in Black Ops 6.
Call of Duty: Black Ops 6 and Warzone are currently available on PlayStation, Xbox, and PC.