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Hi,
According to your description, the “Content not available” error may indicate that OneNote is unable to access or sync the notebook content correctly.
Please try the following:
- Open the affected notebook in OneNote for the web and check whether the content is available there.
- If the content is available online, close and reopen the notebook in the OneNote desktop app.
- Check the notebook's sync status and manually sync it.
- Make sure you're signed in with the correct Microsoft 365 work or school account and that you have permission to access the notebook.
- If the issue only occurs with a specific section/page, check whether other sections in the same notebook can sync successfully.
For more information, see Microsoft's guidance on troubleshooting OneNote synchronization: Troubleshoot errors in OneNote for Windows 10 | Microsoft Support
If the issue persists, please provide the OneNote version you're using and whether the affected notebook can be opened successfully in OneNote for the web.