Hello,
Thank you so much for posting here.
It seems to be offline files sync issue. Hope something discussed here might be of some helpful to you.
https://www.ubackup.com/windows-10/windows-10-sync-center-not-working.html
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Best regards,
Hannah Xiong
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