Authentication Failure for Mail on iPhone

"Authentication Failure for Mail on iPhone: When I go into mail, I am getting an error message. Authenticationfailure. Authenticate invalid credentials. I’m not aware of changing anything. It Worked yesterday. I’ve tried to find an answer on the internet with no success. Can someone please help me fix my email? Thank you."

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Fixing your Credentials:

A. Use a New App Password:

Note that you may need a new App Password, being that Mail is a third party app. You cannot log in using your eMail address password. As an example, you'd go here for gmail: Sign in Using App Passwords - Gmail Help - Google Support

No success?...

B. Add the Account Back:

I've seen quite a few relevant report on this since iOS18 and Sequoia, in regards to Outlook/Hotmail accounts in the Mail app. The solution for that is to remove the eMail account, and then add it back, using the exchange option.

If your mail providor is Yahoo, Go to this link yahoo mail failed to authenticate - Apple Community and do what it says there. Note the instructions are for a Mac, but the basic idea is 1) delete the existing mail account on your iphone, go to Yahoo and get an “app password” and then create a new account with that password as if you are not a Yahoo user.

Turning the phone off worked for me as I’d done all the other things suggested but until I turned the phone off and on, it wasn’t working. Thank you. Something so simple and effective.

You can also try by deleting the email account in the app.

Go to Apps>Mail>Mail Accounts>Tap on the Mail Account. Once deleted restart you iPhone and re-enter your account.

Try the Official Yahoo Sign-in Helper (via Web Browser)

The most reliable way to reset your password is to use the official Yahoo recovery tool outside of the Mail app.

• Open Safari or any web browser on your iPhone.
• Go to the official Yahoo Sign-in Helper page (search for "Yahoo password reset" or navigate to login.yahoo.com/forgot).
• Enter your Yahoo ID, email address, or mobile number.
• Follow the on-screen prompts to receive a verification code (via text or alternate email) and set a new password.
• The in-app reset process can sometimes be less stable than the dedicated web-based recovery page.

Try re-starting your phone. This along with what you did resolved my problem.

I had the exact experience and rebooted and the problem was fixed.

Not true. I have 2 yahoo emails and only one had "failed authentication" msg after I updated my IOS. The other was perfectly fine.

The update affected other password areas too, unrelated to email, which I resolved.

Taking the advice of "queenbeefastliveslow" plus whomever suggested re-starting phone solved it for me.

Power iPhone off. Wait 10sec then power back on. Open MAIL app and emails should start to download.

I changed my Apple password, and got the authentication failure. It fixed itself after I synced the phone with a lightning cable.

Well, if nothing is working for you then I would delete the app and reinstall it.

I actually feel a little stupid,, but I accidentally had put the machine in private mode. This caused a lot of of the issues I was having with signing in signing out. And the mail did the change from private mode to not private. So did this swap make the difference? I really can’t answer my own question but yet I believe that it not only made the difference but fixed all of my issues.

Can’t use new mail icon to access ail. Need to go to aol icon

rhodafromtempleton wrote:

When I go into mail, I am getting an error message. Authenticationfailure.

Authenticate invalid credentials.

I’m not aware of changing anything. It Worked yesterday.

I’ve tried to find an answer on the internet with no success. Can someone please help me fix my email? Thank you.

[Re-Titled by Moderator]

Yes, your email provider can fix your issue, contact them.

aswatkins wrote:

yahoo mail failed to authenticate - Apple Community

Yup still a Yahoo issue not Apples.