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Sign-in & Login Problems

How to Fix OneNote Sign-In Issues on iPhone and iPad

Maira MehtabMaira Mehtab Sep 27, 2026 869 views

Question details

The user is unable to access OneNote notebooks on an iOS device because the app reports that a school account is already signed in.

Product
Microsoft OneNote
Device & OS
iOS (iPhone, iPad)
Scenario
A student is attempting to log in and access school notebooks on the iOS OneNote app.
Observed behavior
The application blocks access, displaying an error message stating that a school account is already signed in.
Before you start

Ensure you have your correct school account credentials ready and are connected to a stable Wi-Fi or cellular network before troubleshooting.

Solution 1Recommended

Verify Account Access via OneNote for the Web

Checking web access helps determine if the issue is isolated to the iOS app or if there is a broader problem with the school account itself.

If you can successfully log in via the web browser, the account is active and the issue lies specifically with the cached credentials or software state of the iOS application.

1
Open a web browser

Launch Safari or another web browser on your iPhone or iPad.

2
Navigate to the Office portal

Go to https://portal.office.com and sign in using your designated school email and password.

3
Check notebook accessibility

Open OneNote for the web to confirm if you can view, edit, and access the notebooks. Take note if it is a personal notebook or one shared by a teacher.

Access Confirmed: If you can view your notebooks on the web, your files are safe and the issue is restricted to your mobile app.
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Frequently Asked Questions

Why does OneNote say my school account is already signed in?

This usually occurs when cached login credentials conflict on your iOS device, or if there is a background syncing issue with your Microsoft 365 school license.

How can I reset the OneNote app on my iPhone to clear the error?

You can clear app data by going to your iPhone Settings, scrolling down to OneNote, and toggling 'Reset OneNote' to delete sign-in credentials. This forces the app to prompt for a fresh login.

Does this sign-in error mean my school notebook is deleted?

No, your notebooks are securely stored in the cloud. You can verify they still exist and are accessible by logging into OneNote for the web at portal.office.com.