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
Troubleshooting steps to help you connect to the Battle.net desktop app.
Troubleshooting for error Code: BLZBNTBGS0000020A
Decryption key is invalid or missing. Please uninstall and reinstall.
Decryption key is invalid or missing. Please uninstall and reinstall.
Error emerges when trying to restore the previous authenticator on a new device
How to remove your Blizzard Authenticator
Blizzard Customer Support cannot lock your account on request