Hi,
Hope you're doing well.
I've been in touch with 2 Microsoft employees who was unable to help me with this issue. Actually spent 1 hour to be redirected to a forum. Great help in wasting my time indeed. One of the worlds biggest companies and specifically the Authenticator - an app specializing in security requires to me post here. Sorry, don't mean to be negative but I can't avoid ranting about this.
Anyway, sorry you had to personally go through that. It's not your fault but please make it easier for people in the future. The case is the following: I recently bought a new phone and traded my old one in, factory reset and all. Logged into both business and personal mail onto it - no problem. Numbers change every 30 sec but it doesn't work - neither does the 2-digit code. Still, I strongly believe that the Authenticator app still thinks the code have to be sent to my old phone. This causes me to not log in to work-related apps and causing me trouble every day. I've been asking my boss to do something about it but he inquired with IT-dep and it falls on the app. Like I asked the two other guys', can you please just delete my old phone so I can make room for my new one. It seems like a real easy problem to fix which has cost me hours and frustration. I've been on forums and tried so many solutions but none take me through. Please, in my final effort of fixing this, can you do me this simple favor? I also read that you need to deactivate the old phone before you factory reset and sell it. I don't even have the phone anymore but there must be a way to fix this without it. Like I said, I strongly believe in the delete old phone solution so please try that.
Best,
Nikolai Sissener