Best answer by Dinh
Yahoo mail actually required user to have a different password if they use 2 step verification or account key https://help.yahoo.com/kb/SLN15241.html
So if you enable 2 step authentication or "account key", you would need to generate a different password within yahoo settings.
This link also might help https://www.lifewire.com/access-yahoo-with-imap-1174534
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So if you enable 2 step authentication or "account key", you would need to generate a different password within yahoo settings.
This link also might help https://www.lifewire.com/access-yahoo-with-imap-1174534