A nix flake providing the necessary python environment to allow registering 2FA apps on battle.net without needing Blizzard's proprietary app.

1. Log in to battle.net account overview
2. On the Security screen select, add a mobile authenticator

$ nix develop
$ bna new # this will output the serial number you must enter into battle.net
$ bna show # this will output the authenticator code you enter into battle.net

3. Submit the form on battle.net and it should succeed
4. Add the code to your chosen MFA application

$ bna show-url | qr # this will generate a QR code you can scan in most OTP apps

Not all OTP apps work with the codes battle.net are using. I can only confirm this works with FreeOTP+.