Hello @muhdbone !
Oh no! I am so sorry to hear that our website is giving you that error message! I will be happy to help!
It looks like that error means there is something wrong on our end. Typically with errors like this, it is usually back up and running within 24 hours or so. Are you still getting this error when trying to log into your account?
Check out our support article for Troubleshoot logging into myAT&T!
Hope this helps! Just keep us updated and have a great day!
Tim, AT&T Community Specialist