@DinkumDog I am using a yahoo account. Was using gmail with same problem. With yahoo to set it up you have to log in online & click buttons to get a password etc so you can actully add the account.
You mean an application specific password?
They are easy enough to set-up but to me it sounds like your mail configuration in Outlook is wrong.
Just to be clear, you are doing this, right:
1) Login to Yahoo with your U/N, P/W.
2) Generate an app specific password in Yahoo - call it 'Outlook' - you'll get given a specific password to use.
3) Go to Outlook and when adding your Yahoo account you are using your Yahoo email as your U/N and then the app specific password, NOT your Yahoo password in Outlook.
4) The rest should auto-configure, but if any errors pop up, post them here, including screenshots if you can that don't show PII.
If you use a third-party email app to access your Yahoo Mail account, you may need a special code to give that app permission to access your Yahoo account. Learn how to create and delete app passwords.
help.yahoo.com