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If you have accidentally deleted the Microsoft Authenticator app and can't log in to your Microsoft school account, you will need to reinstall the app and set it up again. Follow the steps below:
- On your mobile device, download the Microsoft Authenticator app from the app store.
- On your PC, set up the Microsoft Authenticator app from the Security info page for your work or school account.
- From the Microsoft Authenticator app on your mobile device, turn on and use phone sign-in for your work or school account.
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