Why can't I join my friends cod lobby?
If you try to invite your friend to your party but they can't join, add them as Activision friends. It's not enough to have them as friends on either PS4 or Xbox One, you need to add them on your Activision account as well. However, if the first method doesn't work then try to restart the game.
If you've been hit with the error: 'Cannot join the Zombie lobby until the Zombie content is downloaded and installed', ask the party host to head back to the main menu – the one with the options to play Black Ops Cold War, Call of Duty: Warzone, and Call of Duty: Modern Warfare.
- Fix 1. Restart Your Router and Console.
- Fix 2. Enable or Disable Crossplay.
- Fix 3. Re-add Your Activision Friends.
- Fix 4. Enable UPnP.
- Fix 5. Forward the Crossplay Port Used by COD Cold War.
It seems that the only way to solve the problem is to restart the game. However, this is only a temporary fix, as the error message will appear again, and you will have to reboot each time it occurs.
you might try certain methods, such as restarting games and routers (preferably by everyone in party), or switching the host player until finding the best. additionally, you should all take a look at your party settings, which can be adjusted at "social" => "manage party".
The friend is logged in from two platforms – In case you encounter this error only when a friend from PC attempts to join, chances are he is currently logged in from both PC platforms (like Blizzard and Activision), In this case, you can fix the issue by temporarily deleting him from your Social tab before adding him ...
If you try to invite your friend to your party but they can't join, add them as Activision friends. It's not enough to have them as friends on either PS4 or Xbox One, you need to add them on your Activision account as well. However, if the first method doesn't work then try to restart the game.
Go to the Options menu. Head to the Account tab. Toggle the Crossplay option and change it to Disabled. Then turn it on and try joining a game again.
First, you should all try exiting out of Black Ops Cold War and then restart your console or PC, then launching BOCW again. If that doesn't work, there are a few things you can do to get back to playing with your cross-platform friends.
If you have received this warning on your PC, it means that there was a malfunction in your system operation. Error code "0x2" is one of the issues that users may get as a result of incorrect or failed installation or uninstallation of software that may have left invalid entries in system elements.
Is Cold War server down?
Call Of Duty Cold War server is down right now, it could be a server issue. You can check Black Ops Cold War server status, maintenance, and downtime details here.
In many cases, Black Ops Cold War will tell you it's failed to host a lobby when the game servers are experiencing interruptions. It could be that servers went down, or that your connection to the servers aren't entirely stable. This can also cause you to lose connection to other hosts.

If you can't join a party
Press the Guide button on your controller, go to settings, and then select System Settings. Select Network Settings. Select Wired Network or your wireless network name (if you're prompted to do so). Select Test Xbox Live Connection.
If you can't join a party
If you're having trouble joining an Xbox Live party, someone in the party might have a Network Address Translation (NAT) problem. To find out, have everyone in the party test their Xbox Live connection.
Check the Epic Games Status page
Check the Epic Games Server Status page to make sure all systems are operational. If the issue you're experiencing is related to an outage or system-wide issue, you won't be able to connect to the Epic Games Launcher or Fortnite until it's resolved.
Some users encountering the same 93 error code have confirmed that they managed to fix the problem by changing the party privacy to Private before reinviting their friends once again.