Welcome to Windows Central.
You just need to create an App Password from your Yahoo! profile. Follow the following steps:
1. On a desktop computer, sign in to Yahoo Mail.
2. Mouse over your name.
3. Click Account Info.
4. Click Account security.
5. Click Generate app password or Manage app passwords.
6. Select your app from the drop down menu and click Generate.
7. Follow the instructions below the password.
8. Click Done.
Reference:
Yahoo! Help
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