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Hi Ridhesh
Thank you for reaching out to Microsoft Q&A Forum and sharing your experience.
I completely understand how stressful it can be to encounter issues with your important notes, especially when exams are approaching.
To clarify, when OneDrive storage is full, OneNote may stop syncing. If you delink and relink the account or reinstall the app during that time, unsynced pages might remain only on the device and may not appear online. Because OneNote on Android relies on the cloud to save data, if the notes had not finished syncing to OneDrive before you signed out, they might be permanently lost.
However, please try the following steps immediately to see if the data can be recovered:
- First, ensure you update OneNote to the latest version.
- Once updated, please manually force a sync on your Android phone in OneNote using the steps in this article: Fix issues when you can't sync OneNote - Microsoft Support
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- Sometimes notes aren’t fully lost but are temporarily moved. Your next step is to sign in to https://www.onenote.com and check the OneNote ‘Deleted Notes’ view (if available). In some OneNote clients, deleted pages can appear under View > Deleted Notes or Notebook > Deleted Notes. If you find your page, select Restore.
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- Confirm that the content exists online: Sign in to OneDrive.com with the same account you use in OneNote. Open the Documents or OneNote folder and check whether your notebook and section are present. If pages are missing online, they likely never synced from your device before the account was delinked.
- Also, look in the OneDrive Recycle Bin: If the notebook, section, or page was deleted during relinking, you can Restore it.
Since you tagged this post with 'For education', I highly recommend contacting your school’s IT administrator as soon as possible. They have access to the Second-stage Recycle Bin for OneDrive for Business or other advanced recovery tools.
If I have misunderstood your situation, please don't hesitate to clarify, and I will adjust my recommendations accordingly.
I sincerely hope you are able to recover your notes for your exam.
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