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.


[Re-Titled by Moderator]

iPhone 14 Pro Max, iOS 18

Posted on Oct 24, 2024 11:53 AM

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Question marked as ⚠️ Top-ranking reply

Posted on Jan 13, 2025 12:21 PM

how do I correct for Authentication Failure for Mail on iPhone


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Mar 20, 2025 8:37 AM in response to queenbeefastliveslow

Did not work for me. I went to my desktop, logged into the AOL account. Then deleted the IOS connection.


Then back to the iphone. AOL is disconnected. Close the app, open the app, enter back AOL. Then enter your AOL password.


Close app, open app, the mail start coming. I was disconnected on 24 October 2024, apparently others were too.


Any other latecomers: Hope you find this helpful to get your mails back on the iphone.

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Apr 3, 2025 9:20 AM in response to W3ndyW

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.

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Feb 14, 2025 4:09 PM in response to dianafromrolling hills

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.


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Feb 14, 2025 4:00 PM in response to dianafromrolling hills

okay i figured it out! go into mail app and into the account that’s not working. tap the mail slider to off position. wait a second or two and then flip it back on; it will prompt you to log in and whalah! mine had been off for almost two weeks and i couldn’t figure it out. turns out its an intuitive fix—hope you’ve all can find resolve!

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Apr 3, 2025 6:04 AM in response to razmee209

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.


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Authentication Failure for Mail on iPhone

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