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.

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!

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!

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.

Here is the fix!

Go to i phone settings> Scroll down & click on apps> Scroll down & click on Mail app> Click on Mail accounts> Click the Mail account your error is referring to> switch the mail slider to off then back on. It will then prompt you to sign in, once signed in it should be fixed. If error is till occurring, once again make sure the mail slider is turned on.

Had this error for GMail. I fixed it by toggling the Mail off in the Mail settings for GMail, then back on and re-logged in. Then, I logged into the GMail account via the browser. I went to manage account, then Security. There was an error about an attempted login and it wanted me to confirm that it was me. I confirmed, and my email worked.

yahoo mail failed to authenticate - Apple Community

aswatkins wrote:

yahoo mail failed to authenticate - Apple Community

Yup still a Yahoo issue not Apples.

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.

caffiore wrote:

I’m sorry but that is a lame flippant response and not helpful in the least! Why bother to respond at all?

Apple doesn't authenticate your mail unless you're using icloud. OP made no mention of what email provider they are using.

So Apple doesn't authenticate gmail, yahoo, hotmail etc you know who does, that right those email providers authenticate their own system.

IF you have no clue what you're talking, then don't respond at all.

You've provided nothing in this thread.

aswatkins wrote:

No, Yahoo, my email providor cannot fix this. Why would you suggest that?

Yahoo needs to authenticate you not Apple.

If Yahoo can't do it, then I guess you can't use yahoo find another email provider.

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!

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.

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.

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.