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.

Yahoo has gone to this too...

https://help.yahoo.com/kb/access-yahoo-mail-third-party-apps-sln15241.html

Yahoo App password…

Generate and manage third-party app passwords

Some older, third-party email apps (that do not use our Yahoo branded sign in page) require you to enter a single password for login credentials. To access your Yahoo Mail account on these apps, you'll need to generate and use an app password. An app password is a long, randomly generated code that gives a non-Yahoo app permission to access your Yahoo account. You’ll only need to provide this code once to sign in to your third-party email app.

https://help.yahoo.com/kb/access-yahoo-mail-third-party-apps-sln15241.html

Apple's Mail App is tied to the OS Version & doesn't get updated, ThunderBird is working for many.

Yeah, I don't care for WebMail... except over no eMail. :(

Only cure for Apple Mail is a far later OS, since the Mail version is tied to the OS version.

ThunderBird is working for many...

https://www.thunderbird.net/en-US/

philo-gypsy wrote:

Can anybody offer any help?

https://help.yahoo.com/kb/account

Maybe try a different browser, that link opens directly to this in Brave browser...

And Mail still doesn't work?