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Hi T-K3935
Thanks for posting the thread on our forum.
As you mentioned "multiple users are reporting documents on the old SharePoint that are not syncing correctly*",*we would like to know whether users are having problems with files stored in SharePoint Online or SharePoint Server?
Generally, the error message you encountered at the user's end can be fixed by removing the OfficeFileCache folder in the Windows User Profile folder, where the location is C:\Users\User\AppData\Local\Microsoft\Office\16.0\OfficeFileCache (User need to be replaced with the user profile name of Windows where the user is having a problem).
In addition, if the files located are in SharePoint Online, can you please share the following information:
- Screenshot of the error messages encountered.
- Screenshot of Account page for Office apps. Open any Office app such as Excel> Account> Take a screenshot and share with us
- Does the problem happen to the files stored in the specific Document Library in SharePoint Online?
Your understanding and patience will be highly appreciated.
Regards,
Stacey