COD Black Ops 4 Errors & Problems – Failed to Host Lobby, Crashes, Freezing Failed to host lobby in COD BO4A lot of people have been reporting getting this one. There’s a bunch of stuff you could try, but none of it is guaranteed to succeed. It seems like a server issue, but you can try restarting the game, your console/PC, the network equipment you have (router, modem, etc).
If you’re on PC, you could also try using a different DNS or running Battle.net as an administrator. Make sure Windows is updated, and also try repairing the game through the client. COD BO4 crashes, freezing, performance issuesThere have been complaints about poor performance across all platforms. Sometimes they’re tied to a specific map, other times they’re global. There’s nothing you can do about this except verifying game data or reinstalling, and even that is not guaranteed to solve the issue. You’ll just have to wait for a patch.
COD BO4 high ping, lag spikesA handful of players have reported having really high ping and experiencing lag spikes. The servers are apparently taking a beating – it seems Activision didn’t expect the game to be this popular at launch. You’ll just have to wait for them to upgrade their infrastructure. UI Error 21673This one’s pretty specific – it happens when you try to play local coop on the PC version using two gamepads. There’s no known way around it yet, and most people haven’t had luck running split screen with keyboard and mouse for one player and a gamepad for the other.
For Call of Duty: Black Ops 4 on the Xbox One, a GameFAQs message board topic titled 'Lobby not Joinable'.
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I've been getting 2 errors one where when me and friends are in the actual blackout lobby and when we find a game it kicks everyone out the other is when you are actually in the blackout lobby and invite a friend to join you so for the 2nd error the only fix for me so far is ether restarting or going back to the main menu lobby and inviting your friend from there or joining there main menu lobby but for the first error I have not tried playing with the same person again yet so have yet to figure that out good luck.