Signing into my Microsoft account

To regain access to the Microsoft account when the old AT&T email and phone number are no longer available, use the self-service recovery tools and update security info once access is restored.

1. Confirm the correct Microsoft account
   • Go to the Microsoft account sign-in page at https://account.microsoft.com and enter the email address that was used for the Microsoft account.
   • If a password prompt appears, that email is a Microsoft account.
   • If the message "We couldn't find an account with that username" or "That Microsoft account doesn't exist" appears, check spelling and domain (for example, .com vs .co.uk) and try again.
2. Try standard account recovery
   • If the username and password have stopped working, use the recovery flow:
     1. Go to Recover your account at https://account.live.com/password/reset.
     2. Enter the email address, phone number, or Skype name used to sign in.
     3. When asked where to get a security code, choose any recovery option that is still accessible (for example, another email alias or phone number).
     4. Enter the code, then create a new password.
   • If the email is not recognized, try another alias or phone number that may be on the same account.
3. If old email and phone are no longer accessible
   • On the Verify your identity screen, if all listed options (old AT&T email, old phone) are unavailable, select I don't have any of these (or similar) when offered.
   • Fill out the account recovery form with as much accurate information as possible (this process is fully automated and support cannot reset passwords or change account details manually).
   • Use a familiar device and location where the account was previously used to improve the chances of successful verification.
4. If sign-in still fails
   • If the username is no longer recognized even after checks, see the guidance under My username and password have stopped working and, if needed, use the Contact support option provided there to explain that the username has stopped working.
5. After regaining access
   • Sign in to the Microsoft account security settings and update the security info:
     • Add a current email address or phone number as an alias or verification method so future recovery does not depend on the old AT&T email or phone.
     • Use the How to add an email address or phone number to your Microsoft account steps to add new contact details.

References:

• I can't sign in to my Microsoft account
• My username and password have stopped working
• How to check if your email address is a Microsoft account
• How to add an email address or phone number to your Microsoft account
• I lost my email and mobile i used to register in microsoft certification how to transfer or recover account? - Microsoft Q&A
• Can't sign in to my email - Microsoft Q&A
• My account is blocked - Microsoft Q&A
• Please confirm my e mail address as <removed PII>@outlook.com - Microsoft Q&A