Can no longer see Yahoo Email inbox

[The Mule]

I've seen that manually logging in: they ask for your id on one screen, you click a button, then they ask for the password on the next screen, click a button, and then you're in.  Mine has been doing that for a while (over a year?), but cell phone/tablet email apps still work ok.  So far. 

[The Mule]

Whether it's the default or not, my Yahoo settings do not have two step verification turned on, but I do have checked: Allow apps that use less secure sign in.

I don't remember ever changing those.

[Kostya Vasilyev]

Yahoo doesn't seem very aggressive (yet) about turning off "less secure apps" (== "password based login"), so most accounts still should work without having to re-enable.