How do I fix my authenticator sign in issue. I need a QR code to re register

To get a new QR code and re‑register Microsoft Authenticator, the QR code must be generated from the account’s security or sign-in setup page, not from the app itself.

For a personal Microsoft account (Outlook.com, Hotmail, etc.):

1. Go to the Microsoft account Security page: https://account.microsoft.com/security and sign in.
2. Select Manage how I sign in to view your sign-in and verification methods.
3. Select Add a new way to sign in or verify.
4. Choose Use an app.
5. If Authenticator is already installed, select Set up a different Authenticator app, then Next to display a new QR code.
6. On the phone, open Microsoft Authenticator, tap the + icon, choose Personal account, then Scan a QR code and scan the code shown on the computer.
   • If the camera cannot scan, select I can't scan the bar code on the PC and Enter code manually in the app.

For a work or school account (Microsoft Entra ID / Microsoft 365) where sign-in is prompting for setup:

1. Start sign-in to the work or school account until the Set up your account or security info wizard appears.
2. Continue until the Scan the QR code page is shown.
3. On the phone, open Microsoft Authenticator, add a Work or school account (or follow the prompt from the wizard), and use the app’s QR reader to scan the code.
4. If scanning fails, select Can't scan the QR image on the PC and manually enter the code and URL into the app.
5. Select Next on the Scan the QR code page; approve the test notification in Authenticator when prompted.

If unable to reach the security page because of MFA lockout (no working method at all), an administrator must reset MFA:

• For a work/school account, a Microsoft Entra administrator can use Require re-register multifactor authentication on the user in the Entra admin center so that sign-in will force a fresh Authenticator setup with a new QR code.
• If there is no other admin or it is a business tenant where the only admin is locked out, Microsoft support/Data Protection team must be contacted by phone to reset MFA at the tenant level.

References:

• How to add your accounts to Microsoft Authenticator
• Set up Security info from a sign-in page
• Troubleshoot problems with Microsoft Authenticator
• I need to reset my mfa methods - Microsoft Q&A
• Microsoft authenticator sending me into a spiral - Microsoft Q&A
• Microsoft Authenticator app doesn't show 6-digit OTP code - Microsoft Q&A
• Global Admin Locked out - Microsoft Q&A
• Troubleshoot signing in with a passkey