Long paths (>255 characters) and filenames with certain special characters (e.g., # or % ) can cause unexplained sync errors. The error reporting is vague – often just “Sync pending.”
If you encounter errors like "OneDrive has not been set up," try these steps: Clear Keychains Keychain Access onedrive for macos 10.13.6
: If you have an older version installed, it will stop updating. Long paths (>255 characters) and filenames with certain
The most significant technical difference between OneDrive on modern macOS versus High Sierra is the file system architecture. Long paths (>
Microsoft follows a policy of supporting only the of macOS. As of 2025/2026, macOS High Sierra is several generations behind the supported threshold. New Installations : Blocked on macOS 10.13.6.