I have tried to follow all the steps listed for attaching/removing the Authenticator (iPhone app). I’ve deleted the app, reinstalled it, clear my app cache, etc. I either get the “Hmmm, something went wrong, try again later” message, or it tells me my phone number is already in use.
I’ve also tried to connect it via the PC Battle.net app, but that just takes me to a website telling me to download the mobile app. Any help would be appreciated.