While people were excited for Call of Duty: Black Ops Cold War to finally release worldwide, glitches in multiplayer modes are simply ruining the experience. Fans have been taking to social media to report the error message “Unable To Join Party.(3)” or “This Lobby Is Not Joinable” or “Failed To Join Party” appearing when players using different consoles or platforms try to team up in a lobby.
HOW TO FIX THE "FAILED TO JOIN" PROBLEM (EASILY) IN BLACK OPS COLD WAR
There are two ways to make this mistake; first, you can't see your friends online, even if they are. Second, you can't join each other's lobby, even if you can send requests to each other.
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This isn’t a new bug at all, players were complaining about it when the beta launched. Now the problem has grown exponentially with the global launch. Look at this poor soul on Reddit and the comments on the player’s post.