I think someone else is using my Microsoft account

If the account was compromised using a verification code, take these steps immediately:

1. Run a full malware or antivirus scan on the PC before changing anything. Microsoft recommends clearing viruses or malware first.
2. Try the Microsoft account recovery flow for compromised accounts using the sign-in helper tool: Start
3. If access is still possible, go to the Security basics page:
   • Select Review activity and check for unusual sign-in attempts.
   • If suspicious activity appears, select This wasn't me or Secure your account where available.
   • Select Change password and set a strong new password.
4. After regaining access, review account settings that may have been changed, including connected accounts, forwarding, and automatic replies.
5. Do not respond to any verification codes that were not requested.

Important limits:

• Microsoft support agents are not allowed to send verification codes, send password reset links, or access and change account details.
• If the attacker already changed the security information or turned on their own two-step verification, self-service recovery may no longer work.
• If verification messages are not arriving because the account is locked or flagged for unusual activity, that issue must be resolved first.

If sign-in is blocked because of unusual activity, follow the sign-in screen prompts to receive a security code and unlock the account. If traveling or on a new device, signing in from a trusted device or usual location can help.

If verification codes are not arriving, try another listed method on the Security basics page, or choose I don't have any of these to replace security info. If the alternate email is another Microsoft account, use two privacy-mode browser windows so both accounts stay signed in while retrieving the code.

If recovery still fails, use the sign-in helper or Contact Support for technical guidance, but account ownership and security details cannot be changed by support.

References:

• How to recover a hacked or compromised Microsoft account
• What happens if there's an unusual sign-in to your account
• Troubleshoot Microsoft verification code issues