yahoo mail failed to authenticate

And you can login to Yahoo's WebMail in a browser using the same credentials?

Ps. Asked the Mods to edit out a possible password being shown.

What is the mail app's name? the requierments are:

Sign in to your Yahoo Account Security page.

Click Generate app password or Generate and manage app passwords.

Enter your app's name in the text field.

Click Generate password.

Follow the instructions below the app password.

Click Done.

I do not know what my app's name to enter it in the text field...

When asked for an app in the dialog box of Yahoo password generator in security section I wrote "mail" and then all of the following

as described worked. I have my Yahoo Mail account in the Mail app !

Thanks for all the help. I had to change my pacbell/yahoo password yesterday and suddenly I couldn't log into my mac mail on my 2014 iMac running Catalina 10.15.7. I was able to log in on my phone and newish MacBook pro no problem. I followed the instructions here and was able to log in with the one-time password. Mine was actually called something slightly different, but it was under the email section of my pacbell account. I have had this email forever (thus the pacbell.net designation!) but I may need to think about migrating. Also may be time for a new computer!

I had the same issue on a Mac. I would put in the password and would get a warning that the Yahoo account failed to authenticate. I solved this issue by updating the operating system to the latest version which was Sonoma.

Same issue here. Just started recently. We made no changes to the MacOS or app. Same credentials work on the yahoo web mail interface. We switched to the Spark email client and it works fine.

The Latest from Rogers... use a Browser...

Generating an app password is currently unavailable but don’t worry you can still access your email via Web Browser at mail.rogers.com. Additionally, you can integrate iPhone & Android devices. To see how, Set up a Yahoo! account on a device - Rogers.

I my case, I could log in again in the app after I upgraded from macOS 10.15 to 12. I didn't use an app password, simply the old PW.

Exactly same here, I changed my password, now I can't login with Apple Mail.

Mac OS Catalina, 10.15.7

Web login fine, iOs Login fine.

Third party app password "Sorry, this feature is not available at this time."

I wish!! Looks like my problem is with isp - Rogers Canada. They say that yahoo has disabled their 3rd party app passwords for security??? Anyway, still in a holding pattern because the only way I can change or add passwords is through my rogers account even though I sign in with yahoo and can get my mail - I get redirected to Rogers for passwords. Meanwhile, I can’t access my calendar, mail or messaging through the Mac mail app on my lovely brand new computer. Very frustrating Baaah

No it's happening on the latest Ventura as well. If you were unfortunate enough on Rogers to miss the working App Password, which hasn't worked for months, then there is no other way it will work now. This is all on Rogers and has nothing to do with Apple, and specifically "some user"@rogers.com emails.

If you ever experience any issue related to “login failed” in the app.

Try to login to your mail account on a desktop web browser first.. once you’re successfully logged in there then you will not face any login issue with the app on any device.

In the interim in a browser login to Yahoo.com for WebMail.

Try the Thunderbird eMail App & set it as your default eMail App.

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

In Mail>Preferences>Accounts, have you highlighted that account & clicked the tiny minus icon below?