You're not alone. Same issues here. I've tried all sorts of things to access my Yahoo mail from Samsung's native e-mail app but no luck. In the past, Yahoo mail had a setting where you could allow access to 'less secure deviced', which always did the trick. Now this setting has disappeared from Yahoo mail, so I'm clueless as to how to fix this. No, I'm not installing the Yahoo mail app when I have a perfectly capable Samsung e-mail app. No need for 2 apps doing the same thing. As a workaround I now forward my Yahoo e-mail to a Gmail account. Not ideal but it does the trick for now.
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