I'm having a similar problem. I created a private repo, pushed content, and now I want to share it. But I cannot get access to share it. It says I have 2FA configured, but I don't remember doing that, and it may have been on an earlier phone. There seems to be no way to un-configure and re-configure 2FA, and no way to find out which app it thinks I'm using on my phone. I've wasted most of an afternoon on this with no progress.