I tried to unlink “google authenticator” by going to account recovery, since my iphone was swapped by apple. After entering the required info including my email address, serial number and a charactor name, there were 2 buttons available: “reset password” and “unlink authentication”. However, after clicking on the unlink and confirming, I got a message" there’s been an error, contact support". I repeated the process several times, the same result.