(...Don't we all want to be valid)ated??
My mom's Yahoo account somehow disappeared from her Samsung Galaxy tablet. When I tried to connect it again, it would not accept the account key I had sent to her phone. (I tried having it sent to her recovery account, but it didn't come.)
I tried a half-dozen times, but each time it said the code was invalid. That has never happened to me before. As an experiment, I tried to do the same thing on my own Samsung Galaxy phone. Bizarrely, it did the very same thing -- and mine is a Gmail account!
I had assumed the problem was with Yahoo, but I guess not. I've tried a number of times yesterday and today, and this is something I have done many times in the past without a problem.