Are you facing a OneNote sync error that keeps prompting you to sign in again? You're not alone. This issue can be quite frustrating, but don't worry, we've got you covered. In this guide, we'll explore the possible reasons behind this error and provide you with step-by-step solutions to help you get your OneNote sync back on track.
Understanding the OneNote Sync Error: Sign In Again
When OneNote encounters a sync error and asks you to sign in again, it's usually because it's having trouble connecting to your Microsoft account. This could be due to various reasons, such as network issues, outdated app versions, or even incorrect sign-in credentials. Let's dive into each of these possibilities and learn how to fix them.
Network Issues
One of the most common reasons for the OneNote sync error is network instability. Here's how you can troubleshoot network-related issues:

- Check your internet connection. Ensure that your device is connected to the internet and that other apps are working properly.
- Try switching between different networks (Wi-Fi and mobile data) to see if the issue persists.
- Restart your device and router. Sometimes, a simple restart can resolve temporary network glitches.
Outdated App Versions
Using an outdated version of OneNote can also cause sync errors. Microsoft regularly releases updates to fix bugs and improve performance. Here's how to update OneNote on different platforms:
- Windows: Open the Microsoft Store, click on your profile picture, select 'Downloads and updates', then 'Get updates'.
- Mac: Open the Mac App Store, click on your profile picture, then 'Updates'.
- Mobile (iOS and Android): Go to the App Store (iOS) or Google Play Store (Android), search for OneNote, and tap 'Update' if available.
Incorrect Sign-In Credentials
If you're entering the wrong password or using the incorrect account, OneNote might ask you to sign in again. Here's how to ensure you're using the correct credentials:
- Double-check that you're using the correct email address and password for your Microsoft account.
- If you're using a work or school account, ensure that you're using the correct credentials for that account.
- Try signing out and signing back in to refresh your session.
Clearing App Data and Cache
Sometimes, clearing the app data and cache can help resolve sync errors. Here's how to do this on different platforms:

| Platform | Steps |
|---|---|
| Windows | 1. Open Settings (Win + I). 2. Click on 'Apps'. 3. Select 'OneNote' and click 'Advanced options'. 4. Click 'Reset' to clear app data and cache. |
| Mac | 1. Quit OneNote. 2. Open Finder. 3. Press Command + Shift + G. 4. Type '~/Library/Containers/com.microsoft.onenote.mac' and press Enter. 5. Drag the 'OneNote' folder to the Trash. |
| Mobile (iOS and Android) | 1. Go to your device's Settings. 2. Tap on 'Apps' or 'Application Manager'. 3. Select 'OneNote'. 4. Tap 'Storage' or 'Clear Data' and confirm. |
Additional Troubleshooting Steps
If you've tried the solutions above and are still experiencing the OneNote sync error, here are some additional troubleshooting steps you can take:
- Check for any ongoing Microsoft 365 service outages. You can do this by visiting the Microsoft 365 service health dashboard (https://www.office.com/portal/health).
- Sign in to your Microsoft account using a web browser and ensure that you can access OneNote without any issues.
- Try signing in to OneNote using a different device to see if the issue is device-specific.
- If you're using a shared computer, ensure that you're signing out of OneNote completely before closing the app.
We hope that this guide has helped you resolve the OneNote sync error that kept prompting you to sign in again. If you're still experiencing issues, we recommend contacting Microsoft Support for further assistance. Happy note-taking!

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