I would like to inform you that, you can change these settings on Safari browser to autofill your username and password.I would suggest you to, please, try these steps on Safari browser mentioned below as an alternative.
1. Double click the Safari application located /Applications.
2. Select Preferences from the Safari menu next to the Apple, the general menu will populate allowing you to set up download locations and change homepage information.
3. Click on the Auto fill tab.
4. Check the "User name and password" check box under Auto fill tab.
Now open the web mail link you want to access (eg. att.yahoo.com) and sign in. After the sign in click on the “Remember” button which would appear on the top right side of the window. Repeat the sign in for all the accounts and it would be saved in the browser.
In order to find more information about the same, please click on the link mentioned below:
After perform all the steps mentioned above, if the issue persists. It is recommended that please contact AT&T Technical voice help desk 1-877-722-3755 and ask for Mac department (open 24/7). They will help you accordingly.
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