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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Oct 24, 2024 1:46 PM in response to rhodafromtempleton

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.

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Feb 12, 2025 7:26 AM in response to rhodafromtempleton

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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Oct 25, 2024 8:26 AM in response to caffiore

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.

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Feb 14, 2025 4:00 PM in response to TomTom1928

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!

Reply

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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Oct 24, 2024 10:16 PM in response to rhodafromtempleton

"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.

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Authentication Failure for Mail on iPhone

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