Trouble attaching an authenticator

#0 - Oct. 26, 2010, 9:55 p.m.
Blizzard Post
I am holding an authenticator that I tried to add and got an error message when I was trying to attach it to this account saying the serial number was invalid.

I have used this authenticator on another account in the past.

The authenticator may be a year old.
#2 - Oct. 26, 2010, 10:06 p.m.
Blizzard Post
Q u o t e:
I am holding an authenticator that I tried to add and got an error message when I was trying to attach it to this account saying the serial number was invalid.

I have used this authenticator on another account in the past.

The authenticator may be a year old.

Is the authenticator attached to another Battle.net account, Burminate?

If so, you can now only have an authenticator attached to one Battle.net account at a time as indicated in the FAQ:

Battle.net Authenticator FAQ
http://us.blizzard.com/support/article/24660

Q u o t e:
Can I apply my Battle.net Mobile Authenticator to more than one account?

Battle.net authenticators can now only be associated with one Battle.net account at a time. Please keep in mind that a single Authenticator will provide secure access to all of the World of Warcraft accounts associated with an individual Battle.net account.
#4 - Oct. 26, 2010, 10:48 p.m.
Blizzard Post
Q u o t e:
Thanks for the info. I thought you could attach them to multiple accounts.

At one point you could. That was changed very recently as indicated by this post:

Battle.net Authenticator Change
http://forums.worldofwarcraft.com/thread.html?topicId=27026380205