Why? That account has an authenticator and is not subject to hacks due to a wrong passwor.
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Time to change security questions:
http://us.battle.net//wow/en/blog/6968168
http://eu.battle.net//wow/en/blog/5669048
While I appreciate Blizzard's actions, having four of my accounts locked because I share a mobile authenticator across 5 accounts is not my idea of an ideal fix. Especially when I need to reset the mobile authenticator serial number BEFORE I can get into the account on battle.net and remove the mobile authenticator