How to attach an Authenticator to your Battle.net account
Information on recovering a lost Diablo III account
Troubleshooting for error Code: BLZBNTBGS0000020A
Troubleshooting steps to help you connect to the Battle.net desktop app.
Customer Support can assist in recovering Battle.net Accounts if provided with necessary information.
How to resolve being unable to log in due to this error
Troubleshooting for error "Too many attempts" when trying to log in to the Blizzard website
Decryption key is invalid or missing. Please uninstall and reinstall.
Decryption key is invalid or missing. Please uninstall and reinstall.
The login servers received invalid information