What to do if the security code sent to your mail or SMS is not allowing you to authenticate your account
Steps to link a Battle.net account to a Humble Bundle account.
Game cannot be launched because the operating system wouldn't allow the system to write to registry.
Addressing issues when Battle.net Application is stuck on Downloading New Files when launching or installing.
How to change or update a Battle.net account email address.
How to correct an email mistake when creating or updating your Battle.net account
Your account is unable to log into Blizzard services.
Failed to launch Agent or AgentSwitcher. Please close all other applications, temporarily deactivate your anti-virus software, and try again. Alternatively, log in as an administrator and try again.
Possible causes for hearing odd sounds, voices, and effects while playing