I have uninstalled logged in account in Authenticator app

When Microsoft Authenticator is uninstalled and reinstalled, the app does not automatically restore OTP (TOTP) codes unless a backup/restore was previously configured. What to do next depends on whether backup was enabled and what type of accounts are affected.

1. If cloud backup was enabled previously (personal Microsoft account or iOS iCloud backup)
   On the device where Authenticator is now installed:
   • Open Microsoft Authenticator.
   • On the welcome screen, choose Begin Recovery or Restore from backup.
   • Sign in with the same personal Microsoft account or iCloud account that was used for backup.
   • If a valid backup exists, the app will offer to restore your accounts and OTP codes (for supported account types).
   For more details on what can be backed up and restored (Microsoft personal, work/school, and third‑party accounts), see the backup article in the references.
2. If backup was not enabled or recovery does not find a backup
   In this case, the OTP secrets were stored only on the old installation and are now lost. They cannot be recovered from Microsoft Authenticator. Next steps depend on the account type:
   • Work or school account (corporate/university email)
     The account is managed by the organization. Contact the IT help desk / Microsoft 365 or Entra ID administrator and ask them to:
     • Reset or clear your existing MFA methods.
     • Allow you to re‑register Microsoft Authenticator on your device.
   • Personal Microsoft account
     Use alternative sign‑in or recovery options (email, SMS, recovery codes) to sign in at https://account.microsoft.com, then:
     • Go to Security info.
     • Remove the old Authenticator app method.
     • Add Authenticator app again and scan the new QR code with the reinstalled app.
   • Third‑party services (e.g., NordPass, Google, banks, etc.)
     Microsoft cannot restore those OTPs. For each service:
     • Use its account recovery process (backup codes, recovery email/phone, or support contact).
     • Ask them to reset or disable existing 2FA so a new Authenticator setup can be configured.
3. If you also need to sign out/remove Authenticator from the old device
   If the old installation or device is still present, you can remove accounts from Authenticator or clear the app data (Android) / offload the app (iOS) to ensure it no longer receives prompts. This does not restore OTPs but cleans up old registrations.

References:

• Back up your accounts in Microsoft Authenticator
• Microsoft Authenticator FAQs
• How to sign out from Authenticator
• Troubleshoot problems with Microsoft Authenticator
• Lost access to all my TOTPs in authenticator app - Microsoft Q&A
• Microsoft Authenticator Not working - Microsoft Q&A
• Problems with Microsoft Authenticator - Microsoft Q&A
• How to reactivate my Microsoft authenticator app - Microsoft Q&A
• Authenticator locked and cannot access at all after replacing phone - Microsoft Q&A