In order to Change ATT Email Password, you need to try the following troubleshooting tips/solutions. Have a look:

How to Change AT&T Email Password

To change AT&T Email Password online, follow these steps:

1- To log in, use your current user ID and password.

2- At the top of the page, select View Profile from the Top Nav Profile menu.

3- Go to Sign-in Info and click it.

4- Select Change your password for logging in.

5- You should change your password.

6- Changes should be saved.

If you've forgotten your AT&T password, use these steps to reset it:

1-Select the sign-in option from the drop-down menu on the AT&T website.

2- Below the email id and password options, select the Forgot Password option.

3- In the supplied field, type your user id and last name.

4- After entering the captcha code that appears on the screen, click the "Continue" button.

5- AT&T will now prompt you to select a method for changing your password. Users of AT&T have the option of answering a security question or receiving a temporary password.

More Details: https://www.qwikaid.com/blog/how-to-change-att-email-password/