OneDrive File Issues

How to Fix Unsupported Characters in OneDrive File Names on Mac

Aamir Naveed Akram Oct 22, 2026 868 views

Question details

The user is experiencing synchronization errors on OneDrive for Mac due to files or folders being flagged for containing unsupported characters, even though the names appear normal.

How to Fix Unsupported Characters in OneDrive File Names on Mac

Product: Microsoft OneDrive
Device & OS: macOS (e.g., Ventura 13.2.1)
Scenario: Synchronizing business files or shared folders using the OneDrive desktop client for Mac.
Observed behavior: OneDrive fails to sync certain files or folders, reporting that their names contain unsupported characters, despite appearing valid to the user.

Before you start

Ensure you have an active internet connection and verify that you possess the necessary edit permissions for the affected shared folders or OneDrive for Business files.

Solution 1Recommended

Rename Files via OneDrive Web and Reset the Mac Client

Renaming the files directly on the web bypasses local macOS character encoding conflicts, and resetting the client forces a fresh sync.

Often, files created on a Mac may include invisible characters or trailing spaces that are incompatible with OneDrive servers. Renaming them via the browser ensures the server accepts the clean file name.

Access OneDrive on the Web

Open your preferred browser and log in to the OneDrive web library.

Rename the Affected Items

Locate the problematic files or shared folders, right-click them, and select 'Rename'. Remove any hidden characters, trailing spaces, or special symbols from the name.

Quit the OneDrive App

Click the OneDrive cloud icon in your Mac menu bar, click the gear icon, and select 'Quit OneDrive'.

Reset the Sync Client

Reset the OneDrive sync client for Mac by following the official Microsoft command process (typically running the ResetOneDriveApp.command from the app package contents), then relaunch the application.

Rename Files via OneDrive Web and Reset the Mac Client

Sync Resumes Automatically: Once the application is restarted and the unsupported characters are removed from the server side, your files should begin syncing properly to your Mac.

Solution 2

Unlink Your Account and Choose a New Sync Location

If resetting the client fails, re-establishing the account connection to a fresh local folder can resolve persistent permission and sync state errors.

Solution 3

Verify File Permissions and System Compatibility

Ensure your macOS and OneDrive application versions are fully updated and that you have the correct administrative rights to modify files.

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Frequently Asked Questions

What characters are unsupported in OneDrive file names?

OneDrive restricts characters like <, >, :, ", |, ?, *, /, and \ in file names. Additionally, file names cannot begin or end with a space or a period.

Why do file names look normal on Mac but still trigger the unsupported character error?

Mac operating systems tolerate certain characters (like a trailing space or invisible Unicode markers) that Windows servers and OneDrive strictly do not support. This leads to encoding conflicts where the file appears perfectly fine on your local machine but gets rejected by the cloud server.

How do I reset my OneDrive client on a Mac?

You can reset the client by navigating to your Applications folder, right-clicking the OneDrive app, selecting 'Show Package Contents', going to Contents/Resources, and double-clicking the 'ResetOneDriveApp.command' file.

Will unlinking my OneDrive account delete my local files?

No, unlinking your Mac from OneDrive simply stops the synchronization process. Any files you previously downloaded to your local OneDrive folder will remain safely on your Mac's hard drive.

Document & File Issues