I no longer can access yahoo mail from my android mail account or my windows. Only Android yahoo app works. I did your troubleshooting.
I tried all your troubleshooting items at https://help.yahoo.com/kb/fix-problems-mail-sln28075.html?redirect=true and others sites. yahoo mail no longer works unless I'm using yahoo mail on window or yahoo mail for android. very frustrating
1st
ranked

-
Mark McKinney commented
Yes, mine all stopped working last night as well. 2 step auth and changing password did not help.