Recovering a Battle.net Account when the email address has been forgotten
What to do if you get a "Something went wrong" error when logging in to the Battle.net Mobile App
Troubleshooting steps for if you can't claim a gift
Error emerges when trying to restore the previous auth on a new device
Information about retrieving a locked account.
Troubleshooting for BLZBNTBNA00000A8E (2403)
What to do when getting an error that the Battle.net Account has logged in somewhere else.