Hi,
First, ensure that you have enabled two-factor authentication to your Microsoft account, please follow these steps:
- Go to the Security basics page and sign in with your Microsoft account.
- Select More security options.
- Under Two-step verification, choose Set up two-step verification to turn it on, or choose Turn off two-step verification to turn it off.
- Follow the instructions.
Note: As part of setting up this account, you’ll be given a QR code to scan with your device; this is one way we ensure you are in physical possession of the device you are installing the Authenticator app to.
For more, see https://support.microsoft.com/en-us/account-bil...
Now, After you link your Microsoft account to the authenticator app, please follow these steps to unlock the personal vault:
- In your OneDrive, select the Personal Vault folder.
- Verify your identity by choosing a verification method. For example, select Text and follow the instructions to send yourself a text message on your phone.
You can unlock Personal Vault with the Microsoft Authenticator app. The app doesn't need Internet access to generate an access code.
To know more about how to use personal vault, please see https://support.microsoft.com/en-us/office/prot...
Regards
Nik