Happy New Year and thank you for providing the Zoho service.  You were recommended to me for a friend, and I've set up an organizational account at Zoho for myemail@mydomain.com.

I am attempting to set up an IMAP migration from Yahoo to Zoho.  

I am following your instructions here:

https://www.zoho.com/mail/help/pop-imap-migration.html#alink4

1.  All of this makes sense and I am able to set up the IMAP Migration:

https://help.yahoo.com/kb/SLN4075.html

See screenshot "Yahoo Server Migration"

2.  I added an account.  However, I cannot authenticate myself as a user even though I've manually used the username and password on Yahoo multiple times (I've disabled the 2FA such as Yahoo's Account Key).

Error message: "Authentication details provided was rejected by Source server.  Kindly provide valid username and password."

See screenshot "Source User Account Details"