Quote Originally Posted by Ñightsham View Post
As far as I know you can use 1 authenticator with multiple accounts assuming they are under the same name/e-mail address.
Multiple WoW accounts, yes, but not multiple Battle.net accounts.

http://forums.worldofwarcraft.com/th...sid=1&pageNo=1

...Going forward, Battle.net authenticators can now only be associated with one Battle.net account at a time. No changes are being made to how many game licenses a single Battle.net account can support. You can still have multiple World of Warcraft accounts under a single Battle.net account, for instance, and all game licenses linked with a Battle.net account will still be protected if an authenticator is in use.

Those of you who currently have more than one Battle.net account associated with a single authenticator will be able to maintain your existing setup without needing to do anything. This change will only affect new authenticator attachments. ...