Hi @Frank GUZAUSKAS ,
Is it an AT&T Yahoo account?
According to my research, you need to acquire secure mail key and check this link for your POP settings: https://www.att.com/support/article/email-support/KM1086159(Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
A similar thread for your reference: https://learn.microsoft.com/en-us/answers/questions/170605/how-to-fix-error-code-0x800ccc92-on-outlook
In addition, if you cannot add a Yahoo account, you can refer to this article: Can't add an Yahoo! email account to Outlook
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