Authentication Failure for Mail on iPhone

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.

"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.

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.

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