I don’t have my authentication device

If you have lost your mobile device that contains the Microsoft Authenticator app, you can regain access to your account by following these steps:

1. Use Recovery Options: If you have set up alternative recovery methods (like a backup email or phone number), you can try to use those to receive a verification code.
2. Contact Microsoft Support: If you cannot access any recovery methods, you may need to contact Microsoft Support for assistance. You can explain your situation, and they can guide you through the process of regaining access to your account. Make sure to provide them with any necessary details to verify your identity.
3. Reset Multi-Factor Authentication (MFA): If you are an admin or have access to another admin account, you can reset the MFA settings for your account. This can typically be done through the admin portal or by contacting support.
4. Complete the Recovery Form: If you have lost access to all recovery options, you may need to fill out the official recovery form to verify your identity and regain access to your account.

These steps should help you regain access to your Microsoft account without your authentication device.

References:

• How Do I Regain Access to My Account After Losing Access to Microsoft Authenticator? (Urgent Request). - Microsoft Q&A
• Can't use Azure Multi-Factor Authentication to sign in to cloud services after you lose your phone or the phone number changes