How do I get a new QR code to set up authenticator?

If this is a personal Microsoft account, get a new QR code from the account security page:

1. Sign in to your Microsoft account Security tab at https://account.microsoft.com/security.
2. Select Manage how I sign in.
3. Select Add a new way to sign in or verify.
4. Choose Use an app.
5. If Authenticator is already associated with the account, select Set up a different Authenticator app and then Next to display a new QR code.
6. Open Microsoft Authenticator on the phone, select the plus icon, choose Personal account, and scan the QR code.
7. If scanning does not work, select I can't scan the bar code on the PC and Enter code manually in the app.

If this is a work or school account, get the QR code from the Security info page:

1. Sign in to https://mysignins.microsoft.com/security-info.
2. Select Add sign-in method.
3. Choose Microsoft Authenticator and select Add.
4. If Authenticator is already installed, select Next to display the QR code.
5. In the Authenticator app, select the plus icon, then Add account > Work or school account > Scan a QR Code.
6. If the camera cannot be used, select Can't scan the image on the PC and Enter code manually in the app.

If sign-in is blocked because the deleted app was the only verification method, use another available sign-in method first. For a work or school account, an admin may need to help re-register MFA if no other method is available.

References:

• How to add your accounts to Microsoft Authenticator
• Download Microsoft Authenticator
• New phone authenticator app - Microsoft Q&A