Review the services linked to your account. Your ID and any AT&T email addresses you see are linked and share the same password. No matter which one you sign in with, you’ll use the same password and have access to any account or service linked to the ID.
Shared password tips
If you change or reset a shared password, make sure:
You update your password wherever you have it saved. This includes your devices, web browsers, and any apps.
Use the same ID and password to sign in to both myAT&T and your email? Make sure you use the new password to sign in to your AT&T Mail account.