What to do if you receive "Invalid Serial Number"

What to do if the serial number at the back of the physical authenticator is scratched off

Error emerges when trying to restore the previous authenticator on a new device

what to do if player is unable to verify their account with the verification code

How to attach an Authenticator to your Battle.net account

What to do when you get this error code

What to do when a physical authenticator gets out of sync

Need to update the phone number on your Battle.net Account?

What to do if the security code sent to your mail or SMS is not allowing you to authenticate your account

Let us know if you run in to an accessibility problem.