If your OneNote notebooks are stored in Document Libraries on SharePoint and if the SharePoint library you're using has any of the following properties enabled, it could cause synchronization errors in OneNote:
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Required check-in/check-out
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Versions (major or minor)
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Any required Properties columns
Note: You might need SharePoint administrator privileges to view or change these properties. If you can't make changes, contact the SharePoint administrator in your organization.
Turn off Required Check-in/Check-out in the SharePoint Document Library
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Navigate to the document library in SharePoint.
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On the Library Tools ribbon, select Library > Library Settings > Versioning Settings.
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Set the Require Check Out option to No.
Turn off Versions in the SharePoint Document Library
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Navigate to the document library in SharePoint.
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On the Library Tools ribbon, select Library > Library Settings > Versioning Settings.
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Set the Document Version History option to No Versioning.
Turn off Required Properties in the SharePoint Document Library
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Navigate to the document library in SharePoint.
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In the Library Tools ribbon, select Library > Library Settings.
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Under the table titled Columns, see if any items have a check mark under the Required column.
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Click any item marked as required and then set the Require that this column contains information option to No.