@AlisonT101
Adding your email address to Windows mail might fail if you are using two-step verification in your Yahoo Security.
https://www.lifewire.com/two-step-authentication-yahoo-1174470
What to do?
How to Manage Yahoo Mail App Passwords
This is essentially the same requirements that Google uses:
app password
or
less secure
What else?
If you cannot stand it, create an email account to be used with your Scan-to-Email and other mail app setups.
Add that mail account to Windows Mail.
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Question Resolved / Answered, Click "Accept as Solution" .
Dragon-Fur