It is not possible to remove the Battle.net Authenticator from an account with Battle.net Balance
What to do if a forum link cannot be opened
Blizzard servers could not be reached or may be offline.
Information on using the same Battle.net Authenticator on more than one Battle.net account
Information on the BLZBNTBNA00000A8F error message
Types of issues Blizzard Customer Support can help you with on Activision games
What to do if you receive the error "We Can't Find That Battle.net Account" when logging into Battle.net