My MacBook Air Mail cannot connect with ATT/Yahoo

Hmmmm,

Generate an app password

1. Sign in to your Yahoo Account Security page.
2. Click Generate app password or Generate and manage app passwords.
3. Enter your app's name in the text field.
4. Click Generate password.
5. Follow the instructions below the app password.
6. Click Done.

Use this app password and your email address to sign in to your email app.