I have a fix which is rather simple. On your phone (I use an Android device) and launch Yahoo Mail Click the top left corner (the 3 bars) Click ‘Manage Accounts’ Click ‘Account info’ Click ‘Account Key’ Click ‘Get an app password’ An App password 16 letters would show Use this password on your Outlook Mail on your computer instead of your normal Outlook password. This would fix the Yahoo Mail password issue on MS Outlook mail. The reason that I use a phone instead of a computer is that I could easily copy the 16 letter password to my Outlook Mail on my computer. After a month or longer, the Outlook would ask for Yahoo Mail password again. Just repeat the steps and it will be fixed again.
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