NEW IPHONE 17 AND MS AUTHENTICATOR APP

Yes, the Microsoft Authenticator app can be safely deleted from the new iPhone 17 and reinstalled.

If the goal is to restore the backup from the old iPhone (16), use these steps to make sure the backup is available and then reinstall on the new phone.

On the old iPhone (16):

1. Turn on iCloud Drive.
2. Turn on iCloud Keychain.
3. Turn on iCloud Backup.
4. In the Saved to iCloud list, search for Authenticator and turn on the toggle for Authenticator.
5. Make sure Authenticator is updated to version 6.8.33 or later.
6. Open the Authenticator app at least once.

On the new iPhone (17):

1. Delete (uninstall) the Microsoft Authenticator app.
2. Reinstall the Microsoft Authenticator app from the App Store.
3. Open the app; the backup from iCloud should now appear so accounts can be restored.

If Authenticator was already backed up correctly on the old phone, reinstalling on the new phone is a valid troubleshooting step.

References:

• Microsoft Authenticator FAQs
• Back up your accounts in Microsoft Authenticator
• Cannot unlock the Autheticator - Microsoft Q&A