My account has been taken over.

1. Start with the hacked-account recovery flow. Use the sign-in helper for compromised accounts. It asks for the account email address or phone number, then shows the available self-help options or offers the chance to talk to an agent.
2. If the original Gmail address now returns “The Microsoft account you've entered does not exist”, that matches a takeover scenario where the sign-in alias was changed. In that case, submit the Microsoft account recovery form with the account details that were previously associated with the account and provide as much accurate information as possible.
3. After submitting the recovery form, the result is sent to the working contact email entered at the start of the form within 24 hours.
   • If Microsoft verifies the account, instructions to sign back in are sent to that contact email.
   • If Microsoft cannot verify the account, the form can be retried up to two times per day.
4. If sign-in now offers a verification code to an unfamiliar address, do not use that address and do not share screenshots publicly. That unfamiliar address can indicate the attacker changed the sign-in alias or security information.
5. Secure the devices and accounts that still have access:
   • Run a full antivirus scan on the PC before changing any passwords.
   • If Microsoft Defender is being used: open Virus and threat protection > Scan options > Full scan > Scan now.
   • Secure the Gmail account that still works by changing its password and reviewing its security settings.
6. If access is regained, immediately:
   • Change the Microsoft account password.
   • Review connected accounts, forwarding, and automatic replies.
   • Add another way to sign in or verify identity in Advanced security options.
   • Consider enabling passwordless sign-in with Microsoft Authenticator.
7. If self-service recovery does not work, use Microsoft Support contact flow:
   • Go to Contact Microsoft Support.
   • Enter the problem and select Get Help.
   • If needed, select Contact Support to be routed to the best support option.

Important: Microsoft support agents are not allowed to send password reset links or access and change account details, so recovery still depends on account verification.

• How to recover a hacked or compromised Microsoft account | Microsoft Support
• Help with the Microsoft account recovery form | Microsoft Support
• How to help keep your Microsoft account secure | Microsoft Support
• Can I trust email from the Microsoft account team? | Microsoft Support
• Microsoft Account got hacked.. - Microsoft Q&A
• My Account has been hacked and the email has been changed. - Microsoft Q&A