Microsoft account deleted randomly

1. Start with the Microsoft Sign-in Helper tool. If the account shows errors like "We couldn't find an account with that username" or "account doesn't exist", that tool is the recommended path and can either guide self-help or offer the chance to talk to an agent.
2. If the account may have been compromised, scan the PC for malware before changing or resetting anything. In Windows Security, open Virus and threat protection → Scan options → Full scan → Scan now. This is important because changing the password before cleaning the device can let the attacker regain access.
3. After the scan, try to reset the password using Recover your account. When prompted, enter the email address, phone number, or Skype name used to sign in, choose where to receive the security code, enter the code, and set a new password.
4. If the username is no longer recognized, check whether:
   • the email domain was entered correctly, such as .com vs .co.uk
   • the email name was typed correctly
   • another alias or phone number on the account can be used instead
5. If the account has been closed, it can only be reopened during the 30-day or 60-day grace period by signing in at the Microsoft account site and completing the security code check. If that period has passed, it can no longer be reopened.
6. If the account has not been signed in to for more than two years, it may have been deleted and cannot be reopened.
7. If the username has stopped working and password reset does not work, use Contact support and report that the username has stopped working. Support agents cannot send password reset links or change account details without proper validation, but the support path is the documented escalation route.
8. If access is restored after compromise, review account settings such as connected accounts, forwarding, and automatic replies, because those settings may have been changed.

References:

• I can't sign in to my Microsoft account
• My username and password have stopped working
• How to recover a hacked or compromised Microsoft account
• Reopen your Microsoft account
• Check products or services where you used your Microsoft account