My microsoft account was hacked they have changed the email name but i have proof off ownership

Take these steps immediately to try to recover and secure the hacked Microsoft account:

1. Scan the device for malware
   • Before changing any passwords, run a full antivirus scan.
   • On Windows 10/11 or 8.1, use Windows Defender:
     1. Select Start.
     2. Search for Windows Defender or select Windows Defender.
     3. Turn on protection and run a full scan.
2. Use the official hacked-account recovery flow
   • Go to the official guide and start the sign-in helper: Start.
   • The tool will ask for the email address or phone number and then:
     • Show self-help options, or
     • Offer a way to talk to an agent, depending on the situation.
3. Change or reset the password
   • If sign-in is still possible, immediately change your password and make it a strong password.
   • If sign-in is not possible, reset your password using the recovery options.
4. If the email/alias was changed and access is lost
   • Use the account recovery form via the hacked-account guide: How to recover a hacked or compromised Microsoft account.
   • Provide as much accurate information as possible (old passwords, devices, etc.).
   • If the recovery form says the account does not exist or fails repeatedly and the hacker has replaced the security info, there is no alternative technical method to restore that personal Microsoft account; Support cannot override the automated recovery in that case.
5. Check for unusual or ongoing activity (if access is restored)
   • Review the Recent activity page to see sign-ins for the last 30 days and confirm which were not done by you.
   • If anything looks suspicious, follow the guidance in Check the recent sign-in activity for your Microsoft account and What happens if there's an unusual sign-in to your account.
6. Secure mailbox and account settings (after regaining access)
   • Follow Step 3 in the hacked-account article:
     • Check connected accounts, forwarding, and automatic replies for anything added or changed without permission and remove anything suspicious.
   • Remove any attacker-added aliases if you can reach “Manage how you sign in”.
   • Add safer verification methods (for example, Microsoft Authenticator) once access is restored.
7. If recovery keeps failing
   • Try submitting the recovery form again from an InPrivate/Incognito browser and a different device/network, and check junk/spam folders for responses.
   • If the security info has been fully replaced and the form is unsuccessful, there is no additional backend method for Microsoft to restore the account beyond that process.

References:

• How to recover a hacked or compromised Microsoft account
• Hello , welcome to Account help & learning
• What happens if there's an unusual sign-in to your account
• Check the recent sign-in activity for your Microsoft account
• My account got hacked - Microsoft Q&A
• My account got hacked. - Microsoft Q&A
• Cannot Access Microsoft Account After Hacker Changed Email, Advice Needed - Microsoft Q&A
• How do I send an email to Microsoft about my account being hacked and taken over by <removed> ? - Microsoft Q&A
• Hacker set up continuous draft ransomware email - Microsoft Q&A