My old authenticator finally kicked the bucket, and I’m very sad over this. I downloaded the Blizzard App onto a phone because I hear that is what you need now to use an authenticator. Whenever I go into the app to make sure it works, I get stuck in this endless loop. I go to the menu on the app > Authenticator > Enable Now (it is already enabled though), > account settings > then it only gives me an option to turn it on or off again. Where is the “page” that actually lets me use it?
Also, please Blizzard, bring back the physical ones. 
Thank you to anyone who can point me in the right direction.
It doesn’t work like the old style authenticator. You don’t read numbers off the phone and type them into your computer. Instead, when authentication is needed, you’ll get a notification on your phone you have to accept or deny.
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Did you detach the old authenticator from your account? You can only have one active at a time.
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I’d suggest moving this to the Customer Support Forum. They’re really good with helping people through the process.
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Hah. This never occurred to me…shows how old school I am.
I thought I did, but I’ll do it once more just to be sure it all works out.
Thank you, forum ppl!