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This issue occurs because a folder that's named '_private' isn't supported in SharePoint Online. To work around this issue, use a folder name other than '_private' in SharePoint Online or OneDrive for Business. Sorry, this document can't be opened for editing.

If you then get a Set up OneDrive prompt, sign in with your work or school account. OneDrive is the process doing the synchronization. Or browse to the specific folder you want to sync. You try to open an item that exists in the _private folder in Microsoft Office Online, you receive the following error message: Choose Sync to synchronize all the files. When you synchronize the _private folder by using the OneDrive for Business sync app, the folder itself is synchronized, but no files in the folder are synchronized. This file name contains invalid characters. When you synchronize the _private folder by using the OneDrive for Business sync app, you receive the following error message for any files that are in the folder:

Which version of OneDrive am I using? ProblemĪfter you upload or create a folder that's named '_private' in Microsoft SharePoint Online or in OneDrive for Business, you experience one or more of the following issues: In most cases, we recommend that you use the newer OneDrive sync client (onedrive.exe) instead. This article applies only to the previous OneDrive for Business sync client (groove.exe).

Office 365 sync files