Ensure you have the latest version of the Microsoft Authenticator app installed on your new phone. Visit the Google Play Store and check for any available updates.
Restart your new phone. Sometimes a simple restart can resolve minor app issues.
Clear the cache and data of the Microsoft Authenticator app. To do this, go to your phone's Settings, then Apps or Application Manager. Find the Microsoft Authenticator app in the list, tap on it, and look for options to clear cache and data. Clearing the cache and data may require you to sign in again to the app, so make sure you have your backup codes or alternative sign-in methods ready.
Uninstall and reinstall the Microsoft Authenticator app. On your new phone, go to the Google Play Store, search for the Microsoft Authenticator app, and uninstall it. Then reinstall the app and try adding your school account again.
Contact your school's IT department or technical support. They may be able to provide guidance specific to your school account setup and any restrictions or requirements that may be in place.
If the above steps don't work, you can try using other methods to access your school email and resources. Check with your school if they provide any alternative authentication methods, such as SMS codes, email verification, or other authentication apps that you can use temporarily until the issue with the Microsoft Authenticator app is resolved.
It's also worth mentioning that some schools may have specific policies or configurations that affect the use of external authentication apps like Microsoft Authenticator. Therefore, reaching out to your school's IT department or technical support would be the best course of action for personalized assistance with adding your school account to the app.