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Hi Javier,
Thank you for your update. Since you have already found the page that caused this issue, I'd recommend copying this page to a new workbook or document to fix this sync error.
You also mentioned that this notebook is collaborating by multiple users, and thence you couldn't remove this page because once you deleted the page and fixed the sync issue, the notebook would be synced back to your notebook again. In this case, I'd suggest going to OneNote.com and open the notebook in OneNote Online to remove this page.
Please let us know if there is any update.
Best Regards,
Nathan