Where do you locate your serial number for your Auth App ?
On Android it’s in the extra menu (3 dots), and then you click Serial etc.
what about if you have an iphone? i can not locate this serial number either…
Should be the same place. Menu button > serial.
I figured it out. On iPhone open the Battle.net Authenticator:
-Open the slide out menu by tapping the icon at the top left of your screen.
-Tap on Authenticator
-Tap on the settings cog icon
-Tap on Serial & Restore Codes
-Go to Battle. net/security/authenticator/attach/mobile Account and type the Serial Number in Green.
-Go back in the Authenticator to get the manual code.
-You’ll be prompted to sign into the Authenticator app (twice?)
-Process is complete