I read this entire thread because I am equally frustrated with this ridiculousness.
I don't have a 2nd iphone, why would I? Don't have an ipad or mac.
I did turn on "Two Factor Authentication" and that is when this entire problem started.
I can't just turn it off- dumb.
HOW, I repeat, HOW do I use two-factor authentication to log in and approve my account?
My phone keeps stating "Update Apple ID Settings" and I cannot set up apple pay until I sign again. I sign in and get the same recurring problem as everyone one else on this chat....over 2,000 of us, SERIOUSLY?
Signing in to icloud does NOTHING.
Michele