Common ProblemsHaving an issue logging into wow, getting error WOW51900223
We recommend closing out of the game completely and exiting the Blizzard application. Then, relaunch the Blizzard application and World of Warcraft will patch.
If the issue persists, perform a UI reset and game repair to fix any corrupt files causing issues.
If that doesn't work, uninstall World of Warcraft and reinstall. That will reinstall all game data, including the latest patch and should get the client up to date.