Hello denmarfl01
Hi, I'm Karl and will be happy to help you today.
Am a little unclear about your description, specifically as it applies to your Yahoo <UserID>.
To confirm, you are saying that the login ID used to access this account is NOT an email address - am I understanding that correctly?
If yes, you will need to configure this account using the Control Panel <Mail> app which allows a non email address to be used as the login ID but you would still need to use a valid current Yahoo <App Password> as the password for the email account
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a) - With Outlook closed open the Control Panel <Mail> app
Just in case you need info regarding how to access the Control Panel Mail app, that's described in the following article by Outlook MVP Diane Poremsky
Where is the Control Panel Mail icon?
https://www.slipstick.com/how-to-outlook/where-...
If using Windows 11
How to Open Control Panel in Windows 11
https://www.lifewire.com/open-control-panel-in-...
b) - Click <Email Accounts> --> will default to the <Email> tab
c) - Click on <New>
d( - proceed accordingly
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