Today I cannot log into yahoo without creating a new password every time. I create a new password, write it down and also copy and save it in an email. It will ask me to create a six-digit code to my phone which I then enter to create the new password. It now logs me in, and I can use yahoo. When I log out and later try to log in with the new password it tells me invalid password. I have done this 3 or 4 times, maybe more. I have even shut down and restarted the pc in between login attempts. Still can't get in unless I create a new password and get a code. Seems like that is a one-time use method. Again, this just started this morning.